Ported +20 mm Gemini choke 12 Gauge Zoli System model for hunting and clay shooting shotguns.
Choke for shotguns: Breda, Dakota Sport, Sig Arms, Zoli.
Material Options:
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) for all other models.
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