I am trying to determine the difference between two uppers listed. One is the PSA 16" Mid-length A2 Premium Black Friday Upper and the other is the regularly priced PSA 16" 5.56mm 1:7 Mid-Length CL MP Premium Upper. Other than the second one having Palmetto stamped on the barrel, the only other difference I can see is the one on sale doesn't have chromed chamber listed. Not sure if this is really the case or not. They both have chrome lined bores, HP/MPI testing, etc.
So, Mr. Palmetto, what is the difference between these two?
If the one on sale doesn't have a chromed chamber, what would that mean as far as durability? Or is it chrome lined for some other reason?