A clip on AR15 magwell adapter to make an AR magwell the right size for Smith & Wesson M&P 15-22 magazines.
M&P 15-22 magazines are slightly shorter front-to-back than an AR15 magazines, this was to prevent full size mags being accidentally fitted to an M&P15-22, but means they are loose in regular AR magwells which can result in feed issues.
When fitted to the front of an AR15 magwell the precision shim makes the magwell the correct size for use with M&P15-22 magazines, including the Kriss Defiance DMK magwell. Easily removed to use with other magazines.
M&P 15-22 magazines operate the Catch22 bolt hold open catch and Kriss Defiance mechanisms with 100% reliability.
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