Never clean the gas tube - it is basicalyl self-cleaning.
If you are getting intermittent bolt lockback, either your ammo is weak or the magazine spring isn't strong enough. Sometimes a mag spring can get hung up on a round limiter rivet as well.
Try another mag and try some different ammo. Should fix things for you.
Also, lube the pivot pin for the bolt catch.
Cool thanks! That's what I was thinking, underpowered ammo... I think the mags are good, tho...
Lube the bolt catch pin? Never thought of that I'll give it a shot!


















































