I had the same mag issue with my bushy. It seem that alot of the mags are out of spec. I puchased a 308 Pmag and it worked perfect. Call bushmaster to complain about the out of spec factory mag and they sent me a new one. Same problem with the new mag tight fit. Called customer service again this time they wanted me to shippped back the rifle. That aint happening. I can live with crappy factory mags for a $800 308 AR that works fine with Pmags.
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