Some AR's, such as LMT and the Colt LE Models tout a single piece or monolithic upper. I checked out an LMT today and they do seem really sturdy, with no fragile or plastic parts, and they seem somewhat smaller/tighter. They also tout higher accuracy with a 1-piece upper. My question is: Is it worth the extra money, are they really sturdier/more rugged, and are they more accurate???
Also, DI or Piston?....lots more for the piston...
Also, DI or Piston?....lots more for the piston...