AR15&Pmag problem

[WDE91]

I have a newly assembled AR15 built from a Tactical Machining 80% lower and if I remember correctly a PSA lowerpartskit.
This gun does not like my 4 Pmags at all, they all stick and closing the bolt is extremely difficult.
My Colt magazine is no problem at all, drops free and easy to close the bolt.

Any idea on a cure?
I am considering selling/trading them off locally and trying a Gen3 Pmag

[nate76239]

I have Gen 2 10/30 and Gen 3 10/20 and both fit. Maybe try loosening the release button a few turns. Not sure how to go about the bolt closing issue. Take off the upper receiver and insert the mag compare it with the Colt mag doing the same