308USK Posted May 6 Report Share Posted May 6 Hey gang, my brother was sighting-in his 6.5CM that he just put a new barrel on...hoping y'all can help identify the issue: Background: My brother has built countless rifles (small-frame AR's, large-frame AR's, yada yada yada), so this one should not be any different; but, for some damn reason it is. The upper is not one he built, so there are some unknowns there. I can get the details, if it is important/needed, to identify the issue. Rifle used to cycle consistently and would not have any issues. The barrel was too damn heavy, so my brother bought a new lighter-weight barrel and put it all together. Rifle has an adjustable gas block (he has cans, so he uses AGB's just out of habit). Issue Description: Round chambers and will shoot the first round, but then will not feed the next round. He started with the AGB wide open, then down to standard open (18 clicks open), then +/- a small # of clicks, trying to balance gas vs. mass. More often than not, the rifle would require dropping the mag and clearing the jammed round (see attached pic). Hopefully the brainiacs on the forum can help narrow down what is causing the issue! Quote Link to comment Share on other sites More sharing options...
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