Re: LWRC REPR or JP LRP-07 or GA Precision AR-10
If you are going for accuracy, then a GAP AR10 is going to smoke just about anything in terms of accuracy. I would **assume** that with the latest BCGs, gasblocks, magazines, feed ramp contours, and other updates that AR10s have seen in the last few years, that they can run reliably suppressed. The builder can tell you if it would run 100% suppressed. That won't change the fact that they will get filthy. After 22 years in the Army and counting--my hatred of cleaning DI-based ARs led me to dump my DI-based AR rifles.
I've had two AR10s. Both had the old style BCGs. Both had magazines that the guns liked and didn't like with 175SMKs. Jamming would increase with filth--it even happened with the 2008-era AR10 mags with followers, etc. I believe that the older BCG and dirtiness contributed to the failures to feed. Overall (and with matched mags) the rifles were reliable. But I wasn't convinced they would remain that way when I suppressed them.
Since I wanted to suppress and not spend hours cleaning, the piston-fed was a natural choice. REPR had piston, adjustable gas, and acceptable accuracy. My REPR has not jammed, and I only shoot with SR25 and old-style C-Prod mags. As I shoot it more, I may discover that it is finicky with certain mags, but it has not been so far. I stripped all the heavy lube off of the rifle (replacing with MILTECH) and manually cycled it 100 times before I fired my first shot.