Geissele Hi-Speed National Match Large Pin Trigger Set AR-10/AR-15 4.5 lb Black. Specially developed for use in shooting competitions tactical AR builds and hunting trips the large-pin set of the Hi-Speed National Match Trigger lets you switch between 2 different stages to finetune the trigger weight to your exact needs. This trigger set also comes with 3 different spring configurations to match the exact rifle you plan to use including the Service Rifle Designated Marksman Rifle and Match Rifle Spring sets. Each one is specially designed for a specifc trigger weight at each stage giving you unparalled control over the weapon. Please note these triggers are designed for mil-spec AR15/M4 carbine rifles. The AR15 triggers are not compatible with the Sig MPX/MCX weapons or Pistol Caliber Carbine AR15/M4 variants. Using them in these platforms will void the warranty. This is the large pin version of the Geissele Hi-Speed National Match Trigger Series and is designed for NRA High Power Rifle competition with highly modified match-grade Colt AR-15-type rifles. The Service Rifle Designated Marksman Rifle and Match Rifle Spring sets are all included in this purchase. Specifications for Geissele AR-10/AR-15 Hi-Speed National Match Large Pin Trigger Set: Manufacturer: Geissele Color: Black Trigger Shape: Curved Trigger Pull Weight: 4.5 lb Trigger Pin Size: Large Hand: Ambidextrous Gun Make: AR Platform Gun Model: AR-10 M4 AR-15 Gun Type: Carbine Included Accessories: Standard Condition: New Country of Origin: USA Features of Geissele AR-10/AR-15 Hi-Speed National Match Large Pin Trigger Set: 2-Stage Adjustable Trigger Weight; Service Rifle Designated Marksman Rifle and Match Rifle Spring Sets; Large Trigger Pin Package Contents: Geissele AR-10/AR-15 Hi-Speed National Match Large Pin Trigger Set What firearm models does the manufacturer say Geissele AR-10/AR-15 Hi-Speed National Match Large Pin Trigger Set is compatible with? The manufacturer suggests that Geissele AR-10/AR-15 Hi-Speed National Match Large Pin Trigger Set is compatible with AR-15 M4 AR-10Geissele 05-150: Hi-Speed National Match Large Pin Trigger Set AR-10/AR-15 4.5 lb Black