Features: Combat Armory Billet AR Lower Receiver Mil Spec Receivers Made of 7075 T6 Aluminum Billet Magpul style trigger guard machined in Flared Mag-well Compatible with standard frame GLOCK magazines Non Last Round Bolt Hold Open Magazine catch and ejector components pre-installed from the factory Combat Armory machinist take pride in delivering the very best for their customers used by Military Police and Firearms enthusiasts