Fantastic quality - Primary Weapons Systems MK1 MOD 1-P Upper Receiver

I just got the upper a week or so ago and so far it has been 100%. I do not have a high round count through it since I just got it, but it is a very smooth cycling upper and it fits with no wiggle on my Spikes lower. I believe these P models are suppose to be blemished uppers but I can not find a single blemish on my upper at all. Looking forward to further testing this upper out since I prefer DI AR15s over Piston ARs. The gas adjustment works well and will cycle weaker 223 ammo that most other piston systems will not. I still like DI better due to simplicity but this upper has a fantastic piston system.