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Posted: 5/16/2003 11:32:04 AM EDT
Just put a new bilever sir on my brand new RRA M4 upper. WHat a royal pain in the ass. I couldn't get the top piece to fit on properly and when I got it in place the screws for the piece in the delta ring wouldn't line up. I had to do some real fitting to get ti to work. I've had different model sir's on other uppers and installation was a breeze. I remember hearing something about RRA being out of spec. I wonder if this was the case here. Any feedback on your experience?
Link Posted: 5/16/2003 11:34:22 AM EDT
The top pic rail on OLDER RRA uppers (circa the '01 AR15.com limited edition) was indeed not to 1913 spec. Current units are, supposedly. I have mounted an ARMS product on my current-production RRA upper without issue. How old was the upper in question?

Link Posted: 5/16/2003 11:35:38 AM EDT
As far as I know it's brand new. Bought it here fron Big Bore
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AR Sponsor: bravocompany
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