Like a real AR-10 or AR-15, the MTW uses a real steel castle nut which can be removed with an armorer’s wrench by turning it counter-clockwise.
The buffer tube should then unscrew counter-clockwise from the lower receiver.
On MTWs with the FRAC installed like the MTW-308 and Gen-12 MTW Shotgun, a small amount of blue Loctite is applied to the buffer tube threads during manufacturing, requiring a little additional force to remove.
When reinstalling the buffer tube, make sure you don’t screw it past flush with the inside of the lower receiver.
