Geissele Automatics Super Semi-Automatic AR-15 Enhanced Trigger Curved 3.5 lb Black. These finely-tuned AR Triggers by Geissele a Standard Mil-Spec pin and are made from quality tool steel. The Geissele Super Semi-Automatic Enhanced Precision Trigger is easy to install with safety on and disassembles for cleaning. When you need a reliable trigger the Geissele Super Semi-Automatic Enhanced Trigger is perfect. 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 Enhanced Trigger: Manufacturer: Geissele Color: Black Trigger Shape: Curved Trigger Pull Weight: 3.5 lb Trigger Pin Size: Mil-Spec Hand: Ambidextrous Gun Make: AR Platform Gun Model: AR-10 M4 AR-15 Gun Type: Rifle Included Accessories: Standard Condition: New Features of Geissele Automatics Super Semi-Automatic AR-15 Enhanced 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-E does not fit HK416 weapons with firing pin safety Package Contents: Geissele Automatics Super Semi-Automatic AR-15 Enhanced Trigger What firearm models does the manufacturer say Geissele Super Semi-Automatic Enhanced Trigger is compatible with? The manufacturer suggests that Geissele Super Semi-Automatic Enhanced Trigger is compatible with AR-15 M4 AR-10Geissele 05-160: Automatics Super Semi-Automatic AR-15 Enhanced Trigger Curved 3.5 lb Black