Gemini chokes for Beretta Optima - Bore 18,60 shotguns 12-gauge for hunting and clay shooting.
42CrMo4 Alloy Steel, Nickel-plating+DLC
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 (Diamond Like Carbon) coating for all other choke models.
Ti 6Al-4V (grade 5) titanium +DLC
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 (Diamond Like Carbon) coating.
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.
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