On the other hand, s4s4u above shared his experience and mentioned that after removing the tabs on the rail he was using, it hasn't twisted. If I go that route, I'd need to remove them completely and then my concern is that the rail might twist. Its not that the upper is "tight" between the tabs. If the route to go, would be to modify the appears those tabs would need to be filed off completely. There wouldn't be any "File a little and check", "File a little", or "do some fitting". Thanks for the advice, experience, and info so far. So I either need to figure a reliable workaround that solves the tabs problem but won't let that rail rotate, or I need to select a new rail, or a new receiver. I just can't hold the receiver and the rail close enough together to tell if they match up. I'd hope it would but I can't say for sure with those tabs in the way. Even if I did grind off the tabs, I can't say with 100% certainty whether the picatinny rail of the CMR would match up perfectly with the picatinny rail on the upper receiver. I could grind off the tabs but then I fear the rail might be able to rotate. Just wondering if anyone else ran into the same thing with any upper and what they did? They don't even come close to sliding onto the SLR Upper. Unfortunately, the anti-rotation tabs on the top of the CMR rail look like they are going to be a problem. ![]() I've got a 13" Centurion CMR Gen2 "Standard" Rail that I was planning to use on a build with a SLR Upper & Lower. My 4th build and the first time I've run into a rail/receiver compatibility problem so I was wondering if anyone else had a solution they've used successfully, or whether the only solution is really just to select another rail or receiver.
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