Franklin Armory BFSIII HK-C1 Trigger Binary Firing System for HK 91/93/MP5 Curved Black. These Rifle Triggers by Franklin Armory is ideal for both tactical and competitive use with greatly reduced split times between rounds. In position 1 this Franklin Armory 3-Position Trigger is safe and will not fire in position 2 it fires one round per pull and in position 3 it fires one round on pull and one round on release. Compatible with most AR platforms and calibers and works with any BCG this Franklin Armory BFSIII Trigger is a must have for all shooters Specifications for Franklin Armory BFSIII HK-C1 Trigger - Binary Firing System for HK 91/93/MP5: Manufacturer: Franklin Armory Trigger Shape: Traditional Curved Trigger Pull Weight: 4.5 lb Gun Make: Heckler & Koch Gun Model: Heckler & Koch HK93 Heckler & Koch HK91 Heckler & Koch MP5 Gun Type: Rifle Condition: New Adjustability: 3 Positions Features of Franklin Armory BFSIII HK-C1 Trigger - Binary Firing System for HK 91/93/MP5 2G2-BIN-FABFS3HKT: A trigger pull around 4.5 pounds. Ambidextrous Safety Selector. Safety Selector will fit in most two and three position trigger housings. Works in SP5K housings. Trigger housing ejector ejector pin and ejector spring are not included. Will fit most HK 91 93 & MP5 variants and clones Some firearms may require additional fitting Package Contents: Franklin Armory BFSIII HK-C1 Trigger - Binary Firing System for HK 91/93/MP5 What firearm models does the manufacturer say Franklin Armory BFSIII HK-C1 Trigger - Binary Firing System for HK 91/93/MP5 is compatible with? The manufacturer says that Franklin Armory BFSIII HK-C1 Trigger - Binary Firing System for HK 91/93/MP5 is compatible with Heckler & Koch MP5 Heckler & Koch HK91 Heckler & Koch HK93Franklin Armory 05-50000-BLK: BFSIII HK-C1 Trigger Binary Firing System for HK 91/93/MP5 Curved Black