This barrel nut from MadBull is specifically threaded to fit the Western Arms GBB M4 rifles. Allows for installation of MadBull Noveske RAS.
The Noveske RAS includes it's own barrel nut to mount to the receiver and free-float over the barrel. The standard barrel nut is threaded for AEG receivers only. This barrel nut from MadBull is designed to mount to WA M4 GBB rifles, which are threaded differently from AEG Airsoft rifles.