I tried rotating it, just to see if I could get it to wiggle inside the anti-rotation tabs.
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And I put some real effort into it, particularly in an attempt to pull it free of the nut. I'll freely admit that I had my doubts on its ability to stay put when strain was added. Now, having worked with a lot of rails that clamp around the circumference of the nut or screw into the nut, the levered clamp design of the SX looked a little strange to me. Using a carrying handle to ensure alignment between the upper and handguard Usually there is at least a mild mismatch between the rail of the receiver and the rail of the handguard. That's been rare, at least in my experience. The fit between the upper receiver and the top Picatinny rail was perfect on my Colt. To ensure alignment, I used an A2 carry handle to hold the rail in place while I torqued the screws. Once the rail is seated against the receiver and aligned, tighten the two bottom screws down to the torque spec of 60 in-lbs. Not really a problem to me, as that indicates a solid fit, but just a heads up. I personally had no issues sliding it on with my hands, but I have heard that they occasionally need a light tap with a nylon hammer. NOTE: If you are installing this rail over a low-pro gas block, you may need to remove the bias block before sliding the rail over the gas block, then re-install. Note the knurled surface and the wide groove that provides purchase for the clamp. Before attempting to slide the rail over the nut, I made sure to fully tighten the bias block at the top of the rail, and loosen the two screws at the bottom. The supplied barrel nut wrench interfaced flawlessly with the nut and my 1/2" drive torque wrench.
With the history covered, let's focus on the SX.
I've been running a 15" version on my 9mm Colt-pattern pistol caliber carbine for about a month now, and it's gotten attention every time I've been to the range.Ī couple of differences between the SX and the EVO to note:ġ) the inner diameter is smaller, coming in at 1.3" in diameter, as opposed to the EVO's 1.56",Ģ) it uses a proprietary barrel nut instead of the adapter plate of the EVO, andģ) it has an integrated QD at the receiver end. Feeling significantly slimmer than the EVO, it delivers a solid performance, and it looks good doing it. While a significant departure from the EVO, I'm very impressed with this rail.
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