The Wilson Combat AR9 engineers have designed two unique AR9 lower receivers with last-round bolt hold open that are compatible with the most popular 9mm service pistol magazines from Glock. These new billet-machined aluminum receiver models also accept standard AR accessories like furniture, triggers, charging handles, buttstocks and optics. The Wilson Combat AR9 closed-bolt blowback operating system is reliable with a wide variety of 9mm loads, including hollowpoint and +P tactical ammunition. Features a Rogers Super-Stoc w/Cam-Lock; overall length of 33" when extended; stainless steel, match grade threaded barrel; black Armor-Tuff over Hard Coat Anodized aluminum billet receiver.