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Discussion Starter · #1 · (Edited)
One of my first searches on this site, was for "Rainier" and I didn't find anything. I have seen little info on this online, maybe a few blogs or M400 builds on other forums. Manuf website states: "May not fit on some SIG AR’s, specifically the 516 Model"

Well here it is on the M400. Sorry for the dark iPhone pics. Smooth action from either hand, doesn't have any fitment issues that I can see or feel. Hope this helps, enjoy.


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