Re: LMT MWS or GAP AR10?
ETA: I swear when I read the title of this thread you were considering a POF or GAP...my mistake. No personal experience with the LMT, but what follows are some considerations for you. Sorry for any confusion...
Without knowing your intentions with the rifle, it is hard to make a reasonable recommendation between the two.
Both are excellent rifles, capable of sub-MOA accuracy, 100% reliability, and comparable prices (approx. $2500). The GAP 308 semis feature a 3/4 MOA guarantee which you'll find is easily accomplished with proper ammo and with the shooter doing their part. My P-308 20" is getting approx the same accuracy, but I am still working on developing "THE" load for it. I have had some groups in the 1/2 MOA range, but the rifle is consistently 3/4 MOA (still nothing to sneeze at).
The GAP can be had to your specs, with any number of options including barrel length/twist/contour/chamber, stock, grip, handguard, etc. The POF is basically only available from the factory with the same set of options/features with the only differences being barrel lengths (but can be easily customized by the end user to meet whatever specs you want aside from the bbl and handguard).
While you may ultimately get a slight accuracy advantage with the GAP (maybe an addt'l 1/4 MOA or less), I'd put my P-308 up against any 308 semi-auto on the market right now.
The other thing to consider is the wait-time you may be able to tolerate. I know that GAP did have one ready-to-go LR-308 rifle, but I am not sure if it is still around or not. If it is gone, you could experience a considerable wait to get a full build done unless you buy one from a current owner (they come up for sale here once in a while). On the other hand, several dealers have the P-308 rifles in stock and available for immediate shipment.
The question more or less comes down to whether you want/need a DI or short-stroke piston gas system. If you are going to be shooting the rifle suppressed, I'd advise you to lean toward the POF. Otherwise, get with GAP and have the rifle built by the best to your specs.