Brand new gen 3 Brownell’s BRN-180 13.9 P&W upper in .223 Wylde. Based on the AR-18, the upper receiver is a short stroke gas piston system with 3 position adjustable gas block. The barrel is 13.9 inches with a pinned and welded muzzle device to bring the length to 16 inches allowing for stocks and vertical grips. The muzzle device is a Primary weapons systems flash hider plan-B compatible for suppressed use. This one comes on a Foxtrot Mike’s lower receiver but the upper is compatible with all mil-spec AR-15 lowers but the piston driven design does not require a buffer/tube and can be used on lowers with integral picatinny rears for use with folding stocks of your choice.