Statistically, it could be that Mac just got a bad one.
Just seems Sigs QC has dipped over the last few years across the board. Hope they get back to the quality standard they used to be known for.
The PTR-32 is a sweet shooter, but a bit on the heavy side, the SIG 556R is much easier to mount optics to.f you want something that shoots AK bullets but isn't an AK, buy a PTR-32