A list of the internal parts for the AR-15 lower receiver. Please note: AR-15 lower receiver parts and M-16 parts are different, and, As of May of 1986 there can be no new machine guns made for the civilian population.
AR-15 lower receiver parts are as follows:
Buttstock Buffer Spring (Std) Buttstock Buffer Spring (Car) Buffer Assembly (Std) Buffer Assembly (Car)
Selector Selector, Bolt Catch Spring, Bolt Catch Detent Bolt Catch Bolt Catch Roll Pin Magazine Catch, Magazine Catch Assembly, Detent Spring, Takedown Detent, Magazine Catch Spring Magazine Catch Button Aluminum Magazine Catch Button Al Radiused, Front Pivot Pin Disconnector Colt Large hole Disconnector Disconnector, Pistol Grip Screw, Pistol Grip Lock Washer A-2 Pistol Grip, Black Plastic
Selector Spring Detent (Selector) Trigger Pin Hammer Pin Large hole hammer/trigger pin Rear takedown Pin Buttstock Aluminum Spacer.