My first trip out to the range with my CMMG .22LR upper, S&W M&P 22 mags, and Better-Mag S&W 22 Rimfire Magazine Adapter (seen here) was a little disappointing to say the least. The adapter is actuating the bolt catch intermittently before the magazine is empty. Has anyone else had this problem?
When I first installed it, it was activating the bolt catch with no mag inserted, cycling the weapon by hand, about 1 out of 3 cycles. I added a considerable amount of additional lube (to the point it was actually running down the inside of the magwell) and cycled the weapon another 50-100 times by hand and it seemed to improve. At least to the point that it was not locking the bolt back unless the rifle was severely canted. It still activated the bolt catch if the rifle was rotated a full 90 degrees or more from its normal horizontal firing position, but that's to be expect with the way it is designed (there is no return spring on the actuating block of the adapter). I was satisfied with that and wiped the excess lube out of the magwell and prepared for range testing.
However, when I took it out to the range and fired 100 rounds, the bolt locked back prematurely 8 different times when the magazine was NOT empty. I was not canting the rifle at all when shooting. Has anyone else used one of these adapters and had similar problems? How did you resolve them? I want to use this upper/adapter combination for cheap training, mainly firing and reloading drills... I don't really want to be doing FTFe drills with the crappy, short stroking charging handle on the .22 upper...
Any help would be appreciated.
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Originally Posted by msigette
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