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AR15.COM
7/25/2012 11:12:32 AM EDT
Just got my CMMG .22 upper.  Looks great.   I wanted to see if anyone has run into issues with items not fitting on the flattop rail.   My Magpul MBUS is so tight I can't get it off after forcing it on about a half an inch.  

Anyone experience this or anything similar.   It is probably the MBUS.
7/25/2012 2:33:27 PM EDT
[#1]
Some specs in up in the wrong direction between parts. Another Magpul MBUS may fit fine.
A little careful filing on both sides of the MBUS Rail Points may be all that's necessary.
Jewelers Files come in very handy.

Dave S