I bought a couple of S&W 5.45 uppers back when the 7N6 was banned. Never could get to run so moved on a couple of years ago. Revisiting I realized the ASC mags may be the issue. They bind so much it takes a tool to strip them out. Upon inspection it looked like the friction was mostly at the shoulder - blue tape arrow. See scratches on case. A little dremel and now they strip byhand only a little harder than 5.56. I think I can take a bit more off if needed, but will won’t if this much functions. Wish me luck. Next week looks dry so will report back when tested.

The old M7 bayonet doesn’t fit correctly, but looks good.