
Originally Posted by
Sean W.
It's 2016 and rails still don't have anti-rotational features.
I've had NSRs for years and they utilize an anti-rotation pin that mates between the upper receiver and rail. (Note: not all uppers are predrilled for this pin but many are.) A lot of people don't use or feel they need it though as the NSR mounting system is pretty solid. Both mine have pins installed and with locktite, on the mounting screws, they aren't going anywhere.
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