If you are the only guy with a piston AR, and your weapon goes down, you are up the creek.
I beg to differ. At least the LMT shares all but 3 parts with a common DI AR, and can, in fact, be converted to and from DI itself. And when you use it as a piston gun, it obviates the parts that typically go down on a DI gun anyways, such as gas rings and a gas key.
Stags are great rifles, however.