Listen Phil and any others. It is a duffer, fake, not real, not even remotely like the real McCoy, you are being conned. The real McCoy cups the barrel nut from below and is screwed into the band from underneath where a lug on the band seats into the top hidden part of the grip. It works loose after 20 minutes so you tighten the screw which splits the grip.
Lord............, hear my prayers............