The bedrock of the excellent performances boasted by our choke tubes are the materials they consist of. We have chosen to manufacture our products mainly in 42CrMo4 steel alloy, with the exception of thin-walled chokes for which we prefer 17-4 PH stainless steel.
Finally, for those looking for a product of the highest performance level with a minimum weight in sport shooting, we use Ti 6AI-4V (grade 5) titanium.
Let us discover these materials and coatings, as well as the treatments they undergo in order to further improve their performance.
42CrMo4 alloy steel
Approximately 80% of Gemini choke tubes are made of 42CrMo4 alloy steel (EN 10083-3), which is the most widely used steel in this field thanks to it’s excellent quality/price ratio.
This material shows off a hardness ranging from 800 to 900 N/mm², with the right balance between hardness, mechanical strength and toughness. It is also "normalized", meaning the steel undergoes a specific heat treatment that allows it to achieve a perfect microstructural equilibrium. The pieces, once finished, are subjected to Nickel-plating (for internal choke tubes) or Nickel-plating+DLC (for all other models).
This material shows off a hardness ranging from 800 to 900 N / mm², with the right balance between hardness, mechanical strength and toughness, it is also "normalized", i.e. it undergoes a specific heat treatment that allows it to achieve a perfect microstructural equilibrium. The pieces, once finished, are subjected to Nickel-plating (as for internal choke tubes) or Nickel-plating+DLC (as for all other models), which is displayed below.
17-4 PH stainless steel
AISI 630 steel, also known under the trade name 17-4 PH, is suitable for achieving an excellent balance between mechanical strength and corrosion resistance; it reaches the optimal level of these characteristics following a specific heat treatment that it undergoes at the end of processing. Very few companies show off the accuracy needed to carry out such a critical but fundamental stage. This treatment known as "precipitation hardening" or "aging hardening" increases the hardness from the initial 800 N/mm², up to 1300-1450 N/mm², without any deformation.
We prefer the use of 17-4 PH steel for the realization of our thin-walled chokes. These pieces are not subjected to any subsequent Nickel or DLC coating, they are simply bleached. The hardness reached by the material following such treatment allows us to employ it with high coating mass ammunition, and also the use of steel shots (for cylindrical constriction size).
Ti 6AI-4V (grade 5) titanium.
Known as the "strong suit" among titanium alloys, Ti 6Al-4V is the most commonly used. It represents 50% of total titanium consumption worldwide. Such alloy features high strength (900-1200 N/mm²) combined with an absolutely light weight, good formability and high corrosion resistance.
Certainly one of our best applications of this material are Geminis’ shooting choke tubes, which are used by enthusiasts and professionals who need and desire little (very little) weight at the muzzle end. The choke tubes made in titanium are subjected to DLC coating. Given the quality refined material with which they are constructed, they boast a price necessarily higher than the average one in the catalogue.
What coatings are undergone by choke tubes made of 42CrMo4 alloy steel, 17-4 PH stainless steel, Ti 6AI-4V (grade 5) titanium?
The finishing of Geminis’ internal choke tubes is performed exclusively using Nickel-coating, while all the others receive Nickel + DLC coating, let's see what that consists of...
Nickel- Plating
Nickel coating is also called medium-phosphorus electroless nickel-plating (5-9% in P). It is the most widely used among Niplate coatings, thanks to its high wear resistance, good corrosion resistance and low friction coefficient. It conveys a hardness of 700 +/- 50Hv after dehydrogenation at 160-180 ° C for four hours. Nickel plating avoids the oxidation of the pieces and is carried out on all choke tubes in 42CrMo4.
DLC (Diamond Like Carbon)
The DLC technical coating (Diamond Like Carbon) gives the choke tubes an appropriate colour and avoids annoying reflections, which could render the firearm visible. The DLC is a coating in "Amorphous Diamond" providing the choke tube with additional hardness (2500-3000 Hv), extraordinary abrasion and wear resistance, a low frictional coefficient (smoothness and anti-adhesion) and excellent chemical inertness.
We can not unveil the whole "tricks of the trade", yet we were willing to share with you some information that shall help you to choose your shooting partner more accurately. For us quality comes first, as well as your satisfaction when using a Gemini choke tube!
Originally published by Gemini Chokes, Blog, Guides: 06/21/2021
]]>Barrel Extensions are devices to be inserted in the choke tube seat of your shotgun’s barrel sticking out 100 mm past the same. As for some specific models, 50 mm extensions are also manufactured. Their function therefore is, actually, to lengthen the shotgun barrel by 50mm or 100mm (or approx. 2" or 4").
Their characteristic is to be equipped in their terminal part, with the same choke seat of the shotgun, so as to be suitable to house any choke tube you want to install and use for your activities. Gemini Barrel Extensions can be easily combined with the choke tubes already supplied with your shotgun.
Recommended and not recommended for use
You can mount the Barrel Extensions to a self-loading hunting shotgun, while you can hardly install two Barrel Extensions on a superposed shotgun or on a side-by-side shotgun, for two simple reasons: first the interaxle spacing between the barrels may be inadequate, secondly the barrel convergence might be too strict thus making it impossible to use the two extensions simultaneously.
Avoid installing a Barrel Extensions into another (for instance 50 mm + 50 mm) to increase the length of your barrel, we also remind you that it is strongly advised against any extension of the shotgun barrel beyond 80 cm.
When to use an Extender? First of all, you will buy an Extender of +100 mm if the barrel of your shotgun is short (60-70 cm or 23.5-27.5") and you aim to medium long distance shooting. In the second place whereas the barrel of your shotgun is medium (70-75 cm or 27.5-29.5") and you aim at long distance shooting; specifically choose a +50 mm Extender if you have a 75 cm barrel shotgun and a +100 mm Extender if you have a 70 cm barrel shotgun.
Materials
All of the Barrel Extensions are made of 42CrMo4 alloy steel, coated with Nickel + DLC and are available in models for 12-, 20- and 28-gauge.
Installation
In order for the Extender to be light and easy to handle, it is made with the minimum thickness necessary so as to guarantee its efficiency, yet this precaution prevents the creation of slots for the tightening key. For this reason, you will have to manually mount and lock your Extender; its conformation actually offers an excellent grip and does not complicate this operation.
Maintenance and cleaning
Perform a normal cleaning, with the specific Gemini kit or an ultrasonic cleaning machine. Pay attention to the impacts, which might affect its integrity.
Originally published by Gemini Chokes, Blog, Guides: 06/21/2021
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Short distance shooting (within 20 metres).
Given that in order to shoot within a 20 metres distance it is better to use a short-barreled firearm, we recommend for extremely close shots, as for example in case of woodcock-hunting in the weald, the Dispersant choke tube (D), or, alternatively, an SK2 or C constriction size (*****).
For such shooting category the elongated barrel is not necessary, hence we suggest you use Flush choke tubes (internal) or:
In the event that your shotgun is equipped with two barrels, we recommend for the second one a C constriction size (*****) or, alternatively, an SK1 or IC (****) one, with the same type of choke tubes.
It is absolutely not recommended to use long-barreled shotguns for close distance shooting, for this reason, we also advise against the purchase of extensions or choke tubes lengthening the barrel, since they would not render your shot more effective.
Medium range shooting (20/35 metres).
If you are rather used to shooting distances between 20 and 35 metres, the recommended constriction size is definitely the M one (***), the so-called " all-round hunting ". Alternatively, we suggest using an IC constriction size (****).
If the barrel of your shotgun is short, namely between 60 and 70 centimetres, as a priority choice for medium distance shooting we recommend an In/Out +50 mm choke tube. The latter shall allow you to improve the shooting performance without inevitably purchasing a longer barrelled shotgun. Either way you can use Flush (internal), Extended +20 mm and Ported +20 mm choke tubes.
If you own a shotgun whose barrel is between 70 and 80 cm, you may opt for Flush (internal), Extended +20 mm or Ported +20 mm choke tubes.
Whereas your shotgun is provided with two barrels, we suggest an M (***) or, as an alternative an IM (**) constriction size on the second barrel, with the same aforementioned choke tube type (depending on the length of the barrels).
Long range shooting (35/50 metres).
As for long distance shooting, which sometimes are unattainable, we can solely choose an F (*) tight constriction size or even an extremely tight one such as XF, XXF (Extra Full, Extra-Extra Full) otherwise, if shots are not so unachievable, we do confidently recommend an IM (**) constriction size.
If the barrel of your shotgun is short, the only possible choice is an In / Out +100 mm choke tube. If you want to use a Flush (internal), Extended +20 mm or Ported +20 mm choke tube, it is necessary to use an Extension +100 mm. The latter can equally be used with the choke tubes originally supplied with your shotgun.
If the shotgun barrel length is between 70 and 75 cm, an In / Out +50 mm choke tube is sufficient.
Whereas your shotgun is more than 75 cm long, it is advisable to rather opt for Flush (internal), Extended +20 mm or Ported +20 mm choke tubes.
In case your shotgun is equipped with two barrels, we recommend you use an IM (**) or F (*) constriction size on the first barrel while an F (*), XF or XXF on the second one. As for the choke tube type refer to the above (depending on the length of the barrels).
Warning: the extensions, depending on the thickness of the rib, can seldom be used on 2-barreled shotguns since the outer diameter, which is larger, prevents their simultaneous mounting.
In addition remember that, considering the fast burning rate powders currently marketed for cartridges loading, you do not need to extend the barrel of your shotgun over 80 cm
For any hunting type, the suited choke tubes.
To further simplify the explanation and guide you correctly for the best choice, we have drawn the table below showing the shooting distances and the relevant choke patterns, so as to specifically identify the two, three models best suited to your needs.
Short barrel |
Medium barrel |
ong barrel |
Constriction size |
||
Short distance shooting |
Semi-automatic |
Flush, Extended, Ported |
Flush, Extended, Ported |
not recommended |
D, SK2, C |
First barrel |
Flush, Extended, Ported |
Flush, Extended, Ported |
not recommended |
D, SK2, C |
|
Second barrel |
Flush, Extended, Ported |
Flush, Extended, Ported |
not recommended |
C, SK1, IC |
|
Medium distance shooting |
Semi-automatic |
In/Out +50 |
Flush, Extended, Ported |
Flush, Extended, Ported |
IC, M |
First barrel |
In/Out +50 |
Flush, Extended, Ported |
Flush, Extended, Ported |
IC, M |
|
Second barrel |
In/Out +50 |
Flush, Extended, Ported |
Flush, Extended, Ported |
M, IM |
|
Long distance shooting |
Semi-automatic |
In/Out +100, Extension con Flush, Extended, Ported |
In/Out +50 |
Flush, Extended, Ported |
F, XF, XXF |
First barrel |
In/Out +50, In/Out +100 (#) |
In/Out +50 |
Flush, Extended, Ported |
IM, F |
|
Second barrel |
In/Out +50, In/Out +100 (#) |
In/Out +50 |
Flush, Extended, Ported |
F, XF, XXF |
# the convergence of the tubes has to be assessed
With the help of several hunters, friends of “Gemini”, we have drawn up a series of ad hoc articles concerning the wildfowl species most sought after by enthusiasts. From wildfowl like ducks and pheasants also encompassing hares: find out in the section dedicated to Hunting what are the best suited chokes for… it’s up to you!
What about hunting in wetlands?
Before concluding, let us spend a few words on this particular situation. If you are used to hunting in wet areas you certainly know that the legislation provides for the use of lead-free ammunition only. The latter are suitable to all of Gemini choke tubes bearing the words Steel Shot or the lily drawing (they are obviously usable also with lead ammunition).
Extended +20 mm, In/Out +50 and +100 mm choke tubes provided with such engraving are available from the largest constriction size up to the F (*), while Flush (Internal) and Ported +20 mm choke tubes, due to ballistic specific reasons, are featured with the largest constriction size exclusively up to the M (***) one . Whereas the choke tube DOES NOT bear the indication Steel Shoot (or the lily drawing) unleaded ammunition cannot be used, therefore the relevant mounting is impossible in wetlands.
Letters, stars and values.
To understand the correspondence among the different systems for indicating the constriction sizes value (letters, *, decimals) refer to the table below.
Flush (internal) |
Flush (internal) |
Ported and |
In/Out +50 |
|||
XXF |
Extra Extra Full |
- |
- |
- |
1,14 |
- |
XF |
Extra Full |
- |
1,20 |
1,10 |
1,02/1,20* |
1,20 |
F |
Full |
* |
1,00 |
1,00 |
0,89/1,00* |
1,00 |
- |
- |
- |
- |
0,90 |
- |
- |
- |
- |
- |
- |
0,80 |
- |
- |
LF |
Light Full |
- |
- |
- |
0,76 |
- |
IM |
Improved Modified |
** |
0,75 |
0,70 |
0,63/0,75* |
0,75 |
- |
- |
- |
- |
0,60 |
- |
- |
M |
Modified |
*** |
0,50 |
0,50 |
0,50 |
0,50 |
- |
- |
- |
- |
0,40 |
- |
- |
LM |
Light Modified |
- |
- |
- |
0,38 |
- |
IC |
Improved Cylinder |
**** |
0,25 |
0,30 |
0,25 |
0,25 |
- |
- |
- |
- |
0,20 |
- |
- |
- |
- |
- |
- |
0,10 |
- |
- |
SK1 |
Skeet 1 |
- |
- |
- |
0,15/0,13* |
- |
C |
Cilinder |
***** |
0,10 |
0,00 |
0,00/0,10* |
- |
- |
- |
- |
- |
-0,10 |
- |
- |
SK2 |
Skeet 2 |
- |
-0,30 |
-0,30 |
-0,30 |
- |
* the constriction size may vary depending on the model range
Originally published by Gemini Chokes, Blog, Guides 06/21/2021
]]>Flush, Ported or Extended?
Let’s start by saying that the choke tubes are mainly divided into three models; Flush (internal choke tubes), to be totally applied inside the barrel of the shotgun, Ported +20 mm and Extended +20 mm, to be applied inside the shotgun but sticking out 20 mm past the barrel.
The choice among these three models is really subjective, first of all it is essential to explain that the chief discriminating factor consists precisely in the positioning of the same. Are you looking for a choke tube entirely inserted into the barrel and with a lower weight? Then you should choose a Flush one (internal choke tube). You have no problem in terms of weight, you are looking for the utmost comfort and you take care of your equipment maniacally … including time to clean it frequently and thoroughly? Hence you should choose a Ported +20 mm one. You are aiming at a good performance, but you prefer an ordinary maintenance, without too many constraints? In that case we advise you to opt for an Extended +20 mm one. We would like to highlight that the weight is not a real discriminating factor, as at any time you can opt for a titanium choke tube instead a steel choke, suitable of reducing the weight by 40%.
Gemini boasts a wide range up to 14 constriction sizes for the Flush model (internal choke tubes) and up to 11 constriction sizes for the Ported +20 mm and the Extended +20 mm ones. As explained above, all of our choke tubes are made both of 42CrMo4 alloy steel, and Ti6Al4V (grade 5) Titanium Alloy. Steel is a super resistant and high-performance material, with different finishes (external grinding + internal lapping) and treatments (Nickel or Nickel + DLC). Titanium stands out for its strength, elasticity and lightness, shows-off the same finishes as steel and is exclusively available once it has undergone the DLC treatment.
How to orient yourself when choosing a choke tube for sport shooting.
In order to select the best suited model according to your shooting needs we have to mainly consider the type of discipline you practise and understand whether you are going to use the choke tube on the first barrel, the bottom one, which usually shoots closer and with a broader cone of fire, or the one on the second barrel, the top one, which shoots farther and with a tighter cone of fire.
What kind of sport shooting discipline do you practise? Trap, electrocibles, double trap, sporting or skeet? Once you have identified the model, i.e. whether you prefer a Flush choke tube (internal), a Ported +20 mm or an Extended +20 mm one – in compliance with the aforesaid indications – we shall focus on the type of constriction size.
What is the best suited choke tube for Trap shooting?
For Trap shooting with a Flush choke tube (internal) by way of example, we shall use choke tubes with an aperture ranging between 0.60 and 0.80 (also indicated with 6-7-8) on the first barrel and choke tubes ranging from 0,80 to 1,10 (also indicated with 8-9-10-11) on the second barrel, while if we opt for Ported +20 mm and Extended +20 mm models we shall chose a modified (M), improved modified (IM) or light full (LF) type on the first barrel and a full (F), extra full (XF) and extra full (XXF) one on the second barrel.
What is the best suited choke tube for Double Trap shooting?
Do you practise Double Trap shooting? We recommend you use the Flush (internal) model with choke tubes ranging from 0,30 to 0,50 (also indicated with 3-4-5) on the first barrel and with sizes ranging from 0,50 and 0,70 (also indicated 5-6-7) on the second barrel. On the other hand we suggest improved cylinder (IC), light modified (LM) and modified (M) in the first barrel while modified (M) and improved modified (IM) in the second barrel for Ported +20 mm and Extended +20 mm models.
For any type of shooting the suitable choke tubes.
To further simplify the explanation and guide you correctly for the best choice, we have drawn the table below showing the choke tube models and the relevant sport disciplines, so as to specifically identify the two, three models best suited to your "style".
|
|
Trap |
Double Trap |
Electrocibles |
Skeet |
Sporting |
First barrel |
Flush |
from 0,60 to 0,80 |
from 0,30 to 0,50 |
from 0,50 to 0,60 |
from -0,30 to 0,00 |
from 0,30 to 0,50 |
Second barrel |
Flush |
from 0,80 to 1,10 |
from 0,50 to 0,70 |
from 0,70 to 0,80 |
from 0,10 to 0,30 |
from 0,50 to 0,70 |
First barrel |
Ported |
M, IM, LF |
IC, LM, M |
M, IM |
SK2, C |
IC, LM, M |
Second barrel |
Ported |
F, XF, XXF |
M, IM |
IM, LF |
SK1, IC |
M, IM |
First barrel |
Extended |
M, IM, LF |
IC, LM, M |
M, IM |
SK2, C |
IC, LM, M |
Second barrel |
Extended |
F, XF, XXF |
M, IM |
IM, LF |
SK1, IC |
M, IM |
In order to understand the correspondence between the different systems of indicating the constriction size value (letters, *, decimals) refer to the following second table.
Flush (internal) |
Flush (internal) |
Ported and |
In/Out +50 |
|||
XXF |
Extra Extra Full |
- |
- |
- |
1,14 |
- |
XF |
Extra Full |
- |
1,20 |
1,10 |
1,02/1,20* |
1,20 |
F |
Full |
* |
1,00 |
1,00 |
0,89/1,00* |
1,00 |
- |
- |
- |
- |
0,90 |
- |
- |
- |
- |
- |
- |
0,80 |
- |
- |
LF |
Light Full |
- |
- |
- |
0,76 |
- |
IM |
Improved Modified |
** |
0,75 |
0,70 |
0,63/0,75* |
0,75 |
- |
- |
- |
- |
0,60 |
- |
- |
M |
Modified |
*** |
0,50 |
0,50 |
0,50 |
0,50 |
- |
- |
- |
- |
0,40 |
- |
- |
LM |
Light Modified |
- |
- |
- |
0,38 |
- |
IC |
Improved Cylinder |
**** |
0,25 |
0,30 |
0,25 |
0,25 |
- |
- |
- |
- |
0,20 |
- |
- |
- |
- |
- |
- |
0,10 |
- |
- |
SK1 |
Skeet 1 |
- |
- |
- |
0,15/0,13* |
- |
C |
Cilinder |
***** |
0,10 |
0,00 |
0,00/0,10* |
- |
- |
- |
- |
- |
-0,10 |
- |
- |
SK2 |
Skeet 2 |
- |
-0,30 |
-0,30 |
-0,30 |
- |
* the constriction size may vary depending on the model range, consult the catalogue for more details
Is that a bit clearer now? Well, keep in mind that these are general guidelines, moreover Gemini is always recommending that you purchase two or three models of choke tubes and spend some time performing ballistic tests in order to try out them empirically. There are additional variables that may affect the shooting performance, such as the type of cartridge chosen, which we prefer not to deepen at this stage to avoid creating too much confusion.
The present analysis refers to the 12- gauge shotguns, but there are Gemini choke tubes suitable for 20-, 28- and 36- gauge ones.
Originally published by Gemini Chokes, Blog, Guide 06/21/2021
]]>Ported choke tubes, also called compensators and “muzzle brakes” are an absolutely versatile and extremely popular product among sport shooting and hunting enthusiasts.
They are inserted into the barrel of the shotgun and stick out 20 mm past the muzzle of the firearm. Analogously to the Extended ones, they do not add too much weight to the tip and are easy to assemble and disassemble using the appropriate key. If you choose the titanium version you can easily forget the "weight" issue. The choke tubes made of this material are ultra light and weigh up to 40% less than the traditional steel ones.
All the Ported are really performing and effective; in particular they are suitable to reduce the recoil of the firearm and, thanks to the elimination of the "muzzle flash-smoke puff ", to achieve denser and more uniform cones of fire.
But why should we care to get rid of the "muzzle flash-smoke puff”? It is the moment when the gases generated by the combustion of the powder conveying propulsion to the ammunition, come out of the crowned muzzle while continuing to push on the shell (or on the shots). The latter, no longer guided by the barrel, are thus normally scattered and diverted from their best trajectory. That’s precisely the instant in which our Ported choke tube gets into action; less recoil, no more muzzle flash-smoke puff, a better shot. It’s simple!
Recommended uses
As we said, Ported choke tubes can be used for any type of sport shooting, mounted to the first and second barrel: Trap, Double Trap, Electrocibles, Skeet and Sporting.
For we recommend using a Ported choke tube for close distance shooting with short- or medium-barreled shotgun, for medium distance shooting with medium- and long-barreled shotgun, for long distance shooting with long-barreled shotgun.
As for hunting use, they are suitable for any type of tactic and prey.
In order to choose the ideal constriction size for your type of activity we advise you to refer to our tables dedicated to hunting and sport shooting.
Models and materials
Depending on the models you will find 7 or 11 constriction size types in the catalogue, from the largest tightest XXF (1,14) up to the widest SK2 (-0,30) one. Some models are made of 42CrMo4 alloy steel, a super-resistant and high-performance material with different finishes and treatments, including Nickel or Nickel + Diamond Like Carbon (DLC); the latter ensures less friction and extreme hardness. Other models are made of titanium, with DLC treatment.
Ported choke tubes are available for 12-, 16-, 20- and 28-gauge. In addition, if you take hunting trips in wet areas and then use lead-free ammunition, you can buy the appropriate Steel Shot versions displayed in the catalogue from SK2 constriction size up to the M (***) one.
To understand the different nomenclatures that involve these products, we enclose a comparison table between letters and constrictions (in mm and inches) depending on the barrel bore (12-gauge).
Installation and maintenance
Remember to always check that, once installed, they do not rest on the crowned muzzle; this will allow you to avoid any breakage or damage, both to the firearm and to your choke tube. Between the muzzle crowning and the Ported choke tube must always remain a little "void", ranging from a few tenths to about 1 mm, visible even to the naked eye.
Ported choke tubes require slightly more accurate maintenance than the standard ones. They must be disassembled and cleaned more frequently, even in the outer part, since at each strike, the gas slipping out causes material deposition. You can use an ultrasonic cleaning machine or alternatively, we recommend our special cleaning kit which includes 1 brush for the inner, 1 brush for the outer of the choke tube, 1 bottle of detergent, 1 bottle of grease and a small cloth.
Originally published by Gemini Chokes, Blog, Guides: 06/21/2021
]]>Titanium characteristics.
As displayed in the previous articles, the Ti 6Al-4V (grade 5) is the most widespread and commonly used among the existing titanium alloys, as, thanks to its technical and mechanical characteristics, it is suitable to ensure performances very similar to steel, even though it boasts a much lower weight.
The mix of aluminum and vanadium is characterized by high tensile strength (1000-1200 N / mm²) and corrosion resistance, as well as excellent elasticity.
After months of research, hundreds of tests, trials and performance evaluations Gemini has succeeded in combining the best performance of its choke tubes with the lightness and comfort of an absolutely extraordinary material.
Why titanium?
Why choose a titanium choke tube for your sports activities? The answer is really simple. Because it weighs less. This will allow you to better manage your shooting. How much less indeed? Regarding a Perazzi 4a gen. Bore 18,60 Ported 6, for instance the weight is 22.50g as for the titanium version, compared to 40.40g for the steel one. All things considered 45% less weight. If you decide to use a titanium choke tube, then, the crowned muzzle of your shotgun will be actually lighter.
The range on the market.
Gemini currently manufactures titanium chokes for the most widely used shotgun brands in the sports domain: namely Perazzi (18.4-18.6-18.7 fourth-generation boring), and Beretta in both Optima and Optima HP versions, Browning Invector Plus as well as Invector DS, Caesar Guerini and Krieghoff. The range is steadily updated.
As for the models currently manufactured Gemini boasts the same constriction sizes already marketed for steel items. In order to check the available models, consult our catalogue. Gemini currently manufactures titanium chokes for the most widely used shotgun brands in the sports domain: namely Perazzi and Beretta, while further ones are going to be introduced soon.
With regard to both Perazzi and Beretta trademarks the present range includes the same constriction sizes already manufactured for steel items. The Flush for Beretta and Flush for Perazzi 4a gen. Bore 18,60 / Flush for Perazzi 4a gen. Bore 18,40 models range in either case from -0,30 to 1,10 and the same applies to Ported for Perazzi 4a gen. Bore 18,60, Ported for Perazzi 4a gen. Bore 18,40, Extended for Perazzi 4a gen. Bore 18,60 and Extended for Perazzi 4a gen. Bore 18,40.
As for Beretta (Optima HP model) Ported and Extended, you can instead find the SK2, C, SK1, IC, LM, M, IM, LF, F, XF, XXF ones.
The most demanding shooters will be spoiled for choice; the best choke tubes, in the utmost materials, are available in any variant.
To learn more about how to use and maintain your chokes in the best way, read also “5 things you must know for a proper use of the choke tube”.
The treatments.
After undergoing internal lapping and external grinding, any choke tube is marked with the lettering “titanium” and DLC coated (Diamond Like Carbon), i.e. the “Amorphous Diamond” layer providing additional hardness (2500-3000 Hv), extraordinary abrasion and wear resistance, a low frictional coefficient (smoothness and anti-adhesion) and excellent chemical inertness.
The entire production chain is 100% Italian ... Champions such as Alberto Fernandez, Diana Bacosi, and David Kostelecky have already shown great appreciation for the newest Gemini titanium choke tubes. A real satisfaction that we hope will increase the popularity of this real jewel of technology, enshrined in a few of grams.
Originally published by Gemini Chokes, Blog, Guides: 06/21/2021
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