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umarex m4 ops magpul UBR stock

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Uploaded on Jun 13, 2009

the umarex .22lr m4 doesnt use the same lower whatsoever of a regular m4, so theres been a special ubr stock made for this .22lr rifle, i got my hands on a few and heres a demo of taking apart your .22lr rear and assembly of the UBR only found on ebay at NILLA ARMS!!

http://stores.shop.ebay.com/NILLA-ARM...

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