Originally Posted by SSGN_Doc
Carrier tilt is another potential problem with some of the systems available.
of the piston AR systems, factory or drop-in, come with their own proprietary carriers, which has mitigated the carrier tilt issue. They added weight and mass at the back end by making them all full auto carriers and adding metal to their mass. You may
see some shavings in the buffer tube after a lot
of rounds. Other than that, a properly built AR with high quality parts will shoot about as reliably as a piston gun, the quality of either being the deciding factor. Like Bige said, I wouldn't buy a piston gun as my first AR. Now, if you happen to get one free or a super low price, go for it.