Got my pcc chassis model out yesterday
Around 25 rounds to zero the red dot at 25, adjusted to be high so on @ 50 and another 75 all on steel @ 100
Magpul mags 10/17s, 10s and glock 10s. CCI blazer and S&B 124 gr no issues
When the action is cocked, you are able to pull it back slightly about an inch or so, without engaging the main spring
Allows for a check on the round being fed and chambering through the side
Also tried putting a vortex micro 3x on the rail and would not fit, had a similar issue with an eo tech exps qd
Any QD optic rail mounts which are machined with the “claws” on a ” < > “ preset shape (I am probably butchering proper terms) may have issues in mounting on the PCC rail, vs an optic which manually tightens on and off with looser tolerances
Also FYI my model shipped with a “compact” SR9 mag they are not marked or marketed as such, I was unaware and sold on EE who tried and failed to fit with his SR9
Cheers