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Posted: 8/23/2004 4:19:29 PM EST
I ordered one of these (A4), and it doesn't seem to want to fit on my RRA lower.  The back pin will go through, but then the front one won't go through.  Then I'll start over, and I will get the front pin in, but the rear one won't go through.  Anybody have any idea if something is screwed up, or if there is some way to fix this?

Link Posted: 8/23/2004 6:09:24 PM EST
Welp, using a failure mode test I gotta ask if you tried any other uppers on this lower, and vice a versa?  I will also say that I would be more inclined to file the hole on the upper (uncontrolled item) versus the lower.  Just a thought mind you.
Link Posted: 8/23/2004 6:57:02 PM EST
About once a week there is a thread on some upper or the other not fitting on a Rock River lower.  Check back in some of the older threads.

I would use a file and very carefully remove enough metal on the upper to get it to fit.

My LAR upper fit on my RR lower but was snug.  It fit on my Bushy fine.

Link Posted: 8/23/2004 7:46:55 PM EST
My LAR is very tight. It slaps right on a bushmaster, but it sticks pretty bad on my RRA.
Link Posted: 8/25/2004 6:35:19 AM EST
My LAR upper fits perfectly on my Oly lower, tight in my DPMS, and way too tight in my RRA.
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