Yeah, done that.. but, I can't get the barrel away from the upper receiver. I get the handguard off, the front sight off, the mock gas tube off, but then can't remove anything more.. there's nothing to unscrew, and the cog-like bit doesn't move at all.. any ideas?
And do I need the mock gas tube? I can't see that it does anything at all apart from look better?
EDIT; I just forced the delta ring and it unscrewed pretty easily, was glued or something.. Problem was my outer barrel wasn't aligned properly, so the front sight and hop-up sat at funny angles.