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Posted: 9/18/2004 11:42:21 AM EDT

I recently purchased a mid-lenght upper from M&A parts. I what to install a ARMS SIR 58 rail.

Their web site states that the SIRS only fit on colt, armalite and bushmaster uppers? True or false?

Link Posted: 9/18/2004 1:31:26 PM EDT
True or false? Who knows for sure.

I do not see any reason why it would not fit your upper as long as the upper is a true mid-length upper like those made by ArmaLite and RRA.
Link Posted: 9/18/2004 2:37:21 PM EDT
Link Posted: 9/18/2004 6:11:57 PM EDT
[Last Edit: 9/18/2004 6:12:45 PM EDT by techbrute]

Originally Posted By new-arguy:
If Im not mistaken, their www site says they only guartantee the SIRs to fit on Armalite, Bushmaster and Colts. The rest can be a crap shoot. It may work on your M&A gun, it may not. Truth be told, it probably will, but you wont know till you try.

You are correct. Their statement only applies to their guarantee of fit. They aren't implying that they won't fit others.

I have a #58 installed on a RRA mid-length upper, and a #45 on a DPMS upper. Perfect fit.
Link Posted: 9/18/2004 6:52:55 PM EDT
I have a 58 on my RRA upper, fits great and I wouldn't trade it for any other. I think the early RRA flattops were supposibly out of spec, could just be a rumor, I don't know. I called Rock River before I bought my SIR, they said it would fit just fine, and it did. I would highly recommend the SIR 58.
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