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AR15.COM
2/15/2012 5:05:08 PM EDT
nevermind
2/15/2012 6:16:49 PM EDT
[#1]
I would call them in the morning.
2/23/2012 4:14:13 PM EDT
[#2]
For what it's worth: when I had Adco install the SS rail on my middy, they left that part off. In fact, I never even knew there was an anti-rotation screw until I bought an SS for my carbine and installed it myself.

I've never had a problem with the rail rotating on the middy.