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Mine did the same thing. It was dirty.
Are you/him sure that it’s every other round?
Had the same issue with my Grendel. If it's a brand new BCG it needs to be broken in. After about 200rounds it smoothed right out and haven't had any problems since.
More often than not. It’s one of four things.MagazineBuffer springBuffer weightGas flow. Gas port size/ gas port alignment.
Quote from: CAMPMEAT on May 11, 2019, 05:58:47 PMMine did the same thing. It was dirty.It was the first time he shot it but that was my first thought.
Quote from: Eric M on May 11, 2019, 06:26:47 PMQuote from: CAMPMEAT on May 11, 2019, 05:58:47 PMMine did the same thing. It was dirty.It was the first time he shot it but that was my first thought.Mine was not cleaned when I first got it. I just shot it and it was full of crud. Brake cleanered it and oiled it and that was all it took.....
Quote from: Biggerhammer on May 11, 2019, 05:59:12 PMMore often than not. It’s one of four things.MagazineBuffer springBuffer weightGas flow. Gas port size/ gas port alignment.Look who's back! Should we start a count down until your next "vacation"
Quote from: Biggerhammer on May 11, 2019, 05:59:12 PMMore often than not. It’s one of four things.MagazineBuffer springBuffer weightGas flow. Gas port size/ gas port alignment.Look who's back! Should we start a count down until your next "vacation" My suggestion was going to be either the buffer spring/weight or the gas system. They're pretty common issues with home built guns.