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Franklin Armory BFSIII AR S1 & C1 are each a legal binary trigger system that gives a 3rd position of the safety lever allowing the trigger to fire both on pull and release, similar to automatic fire. Firearm retains standard capability of semi auto and safe positions, in addition to binary mode. Fits in any standard pattern AR-15 rifle or pistol lower. Same day installation in your firearm available for $40. These trigger systems are on the short list of items to be banned, so if you want one, you better get it while you can. New in factory packaging. Both straight and curved triggers available. Bargain priced at $369, with shipping available for $15.