Preorder for 20" Aug barrel with headspaced extension. Barrel is threaded 1/2-28
If you need a barrel stub pressed out, please mail the extension to us with a copy of your order receipt. This will help us keep track of your specific stub so they do not get mixed up. Please clean (degrease) and strip the stub (remove muzzle device for long barrel pieces) as best as possible. Dirty or greasy barrel stubs may be charged a cleaning fee.