They look good on paper but myself and another shooter local to me have both ran them hard and gas rings wore out under 1k rounds. As in, two of the three rings completely disintegrated around the 750 mark. I never got a chance to closely inspect it after discovery, ex-wife has it for now. Buy with caution, and be sure to keep either a set of known quality gas rings, extractor, etc on standby, or at least a MacFarland ring if the PSA fails. When mine gave out it ruined a range day, no big deal, but all of my serious-use guns have Sionics and Colt bolts.
In heavenly love abiding, no change my heart shall fear;
and safe is such confiding, for nothing changes here:
the storm may roar without me, my heart may low be laid;
but God is round about me, and can I be dismayed?
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