Knight's Armament AR-15 Combat Trigger Guard Kit Black. It is compatible with most mil-spec AR-15 lower receivers but may require slight fitting in some instances. Specifications for Knight's Armament AR-15 Combat Trigger Guard Kit: Manufacturer: Knight's Armament Gun Make: AR Platform Gun Model: AR-15 Color: Black Country of Origin: USA Package Contents: Knight's Armament AR-15 Combat Trigger Guard Kit What firearm models does the manufacturer say Knight's Armament AR-15 Combat Trigger Guard Kit is compatible with? The manufacturer suggests that Knight's Armament AR-15 Combat Trigger Guard Kit is compatible with AR-15Knight's Armament 20491-1: AR-15 Combat Trigger Guard Kit Black