AR-15 Tactical Assault Pistol can be configured in any barrel length and is muzzle threaded to accept a Suppressor. Depending on the barrel length you choose you can get most of the Suppressor unit under a Rifle Handguard. Pistol Uppers can be Chambered in 300 AAC Blackout, 264 LBC and of course 223 Wylde to accept Nato and Remington Cartridge.