I would like to know as well. I really want to remove the stock hand guards and install the MOE one form magpul, just to make it look and feel like my 5.56 for training reasons.
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One of these allows you to mount a normal handguard.
http://www.tacticool22.com/shop/smit...rter-p-14.html
I looked on you tube and there are several videos on how to do it. This is gonna be expensive.
Thanks