Thanks, I found it. Was an MCX. I was looking at one a few months ago and the thing that really impressed me were the ergonomics and how light it was. What I really didn’t like was the horrible trigger pull. I’d like to have one, but I haven’t done the research yet to see how much, if any, of the MCX is compatible with standard AR parts, primarily the trigger. I’m a big fan of Sig, but much of their stuff is proprietary, and that creates some disadvantages.
“...how much, if any, of the MCX is compatible with standard AR parts, primarily the trigger.”
According to Sig, the upper is compatible with an AR lower, so everything below the line is OK, but pretty much nothing above is.