It's quite Humorous to read these responses like "I know someone that has one of those" or "I've heard this or that about it and you are just asking for problems" yada, yada, yada and as it turns out, they really don't have a friggen clue of what they are talking about.
If you really want a WSSM upper, call Mike, he'll set you up with one that will, well, once you shoot it, you'll very quickly find out for yourself that those "that know someone and he has problems", really has little or absolutely nothing to offer. Mike builds a very high quality AR, Period.
OMG...DANGER....DANGER
MAGAZINES WHERE DO I FIND MAGAZINES??
Don't fear the "MAGAZINE NIGHTMARE MONSTER" it happens to be a very simple adjustment to a standard 20 round mag and a little smoothing of the follower, I've done several and it takes about 5 minutes.
They don't wear out barrels any faster than a standard 243.
They shoot with eye popping accuracy and function as smooth as any standard AR15.
The brass is thick and lasts forever, however, it is important to resize properly for proper feed and function.
The brass is easily available from many sources, Cabela's, seems to always have some in stock.
Yes I have one, I love it, it's several years old and gets fired on a very regular basis. It will still shoot under 1/2 MOA when I do my part. It kills coyotes and deer with real authority. No it's not a DTECH it's just a plain old Oly Arms but it works very well, always has. It feeds anything I put through it. The WSSM calibers are the kick azz setup for AR's