The Amend2(R) 15/20 magazine is a sturdy, reliable 5.56x45 NATO (.223 Remington) AR15/M4/M16 magazine made of an advanced polymer material that has the body of a 20-round magazine but only holds 15-rounds for states with capacity restrictions. It is a light, durable, and excellent alternative to the standard M4/M16 USGI aluminum magazine. The 20-round body profile is ideal for added maneuverability and weapon handling. Backed by the Amend2 limited lifetime warranty. | AMEND2 AR15 Mod2 15/20 5.56mm Firearm Magazine 15 Round