PTAC is definitely lower quality. Most PTAC is not machined as nicely. I wouldn't buy a PTAC lower parts kit... The firing control groups are functional, but pretty rough. Lots of PTAC uppers aren't even chrome lined, MPI or HPT. I point that out because it is kind of an industry standard nowadays, but they do it to offer a cheaper product.
that being said, most rifles out there aren't chrome lined, MPI, or HPT. I'm sure a PTAC upper that is well cared for will last decades.



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