Originally Posted By WholeBunches:
Fired 79 jacketed and 79 frangible rounds with mine yesterday (SLR gas block). Afterwards it was virtually impossible to turn the gas adjustment screw clockwise to reduce the gas. I removed the screw and cleaned as best I could inside the gas block. Even removed it from the bbl. Finally got it so I could screw it all the way in to closed position. I will fire it more today, but only use jacketed ammo (the frangible bullets shoot dirtier than jacketed and are lower pressure; they are made from compressed lead and bakelite I've read) and see if it gets as gunked up.
Fired 152 jacketed rounds today. Gas block not as jammed up as yesterday, but still had to use pliers to get the adjustment screw to turn at all. Without taking it apart and cleaning more, I cannot adjust it to OFF. Impossible to turn off in the field once you've fired a quantity of rounds through it. At this time, I can no longer recommend the SLR adjustable gas block IF YOU NEED A GAS BLOCK THAT IS EASILY ADJUSTABLE. If you only need one to adjust once to balance the gas in your AR and then leave the setting alone, it would be OK. Guess it's time to contact the maker, as my experience is not like what is listed on their web site.