Geissele Super Semi-Automatic AR-10/AR-15 Trigger Curved 4.5 lb Black. These AR Triggers by Geissele provide accurate trigger control for long shots and close combat. The Geissele Super Semi-Automatic Precision Trigger is perfect for hunting law enforcement and home defense. Please note these triggers are designed for mil-spec AR15/M4 carbine rifles. 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. Specifications for Geissele Super Semi-Automatic Trigger: Manufacturer: Geissele Color: Black Trigger Shape: Curved Trigger Pull Weight: 4.5 lb Trigger Pin Size: Mil-Spec Hand: Ambidextrous Gun Make: AR Platform Gun Model: AR-10 AR-15 Gun Type: Rifle Included Accessories: Standard Condition: New Features of Geissele AR-10/AR-15 Super Semi-Automatic (SSA) Trigger: Sear surfaces are cut by a wire edm machine; A full force hammer spring is used for quick locktime and positive ignition of all types of ammo; There are no adjustment screws to come loose; All springs are captive; The entire trigger can be dissembled for cleaning; The trigger can be installed without removing the safety; Sear engagement is pre-set from the factory; NOTE: The Geissele SSA does not fit HK416 weapons with firing pin safety Package Contents: Geissele AR-10/AR-15 Super Semi-Automatic (SSA) Trigger What firearm models does the manufacturer say Geissele Super Semi-Automatic Trigger is compatible with? The manufacturer says that Geissele Super Semi-Automatic Trigger is compatible with AR-15 AR-10Geissele 05-101: Super Semi-Automatic AR-10/AR-15 Trigger Curved 4.5 lb Black