HELP!  I managed to score a non-chainsaw Gen 2 lower and am buying all the parts for the newest addition to the collection while I am deployed (80 more days!) and am running into a small issue.  I want to use an NSR rail and am trying to find out what upper receivers are compatible with it - I have seen that some have issues due to the anti-rotation pin on the NSR?  I have been looking at the Noveske and VLTOR MURs, and am wondering if the VLTOR is compatible with the NSR, or what other uppers the NSR will work with so I can get all the parts ordered and waiting on my workbench for when I get home.

Thanks for the help

https://www.rainierarms.com/?page=shop/detail&product_id=1611

I'm pretty sure the NSR will work with any upper. The anti rotation pin that Noveske uses on their factory rifles is nice but not necessary. I have NSR rails on a few different uppers regular mil-spec, Vltor and a larue stealth.  I never had any problems.

Dude...you RULE!  Thanks for the info...now I don't have to sweat the build so much...and I can focus on FINDING a 13.5 or 15" NSR

Its always nice to find a site that has helpful folks...never would have had the success with reloading and building my wet tumbler if I hadn't found this place...and now I can add my first scratch AR build to the list with help from here...

I have an nsr on my sun devil upper. I don't have the pin installed and have 0 issues.

Have one on an Aero Precision upper with no pin and 0 issues.