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i use one on my 9mm pcc with the whole low recoil set up (hydridic buffer and 2 extra weights google it) and its like shooting a pellet gun in comparison to a regular set up. only issue is its a little lose on a mil spec tube
Don't get me wrong it does its job as a an djustable gas block but the one I had kept having gasses escape out from under it making marks in the barrel and that was with it tightened all the way down