Took the POF SMGPK out to the range this evening for the first time as an SBR. I put 200 rounds through the barrel without any issues. She’s dead on accurate at 30 yards. I must say, can feel a little difference in the recoil between my Zenith Z5P and the POF SMGPK reverse stretch. The reverse stretch seems to have less recoil compare the K model. Not by much but I can certainly feel the difference.
I am assuming the difference is the reverse stretch having the full size MP5 receiver with a longer distance for the bolt to travel vs. the K model with the shorter receiver and less distance for the bolt to travel.
I’m really loving the POF SMGPK reverse stretch more than the Zenith Z5P!