My 2 Cents
Older CZ factories work as well for me! But seemed 2nd rate quality, and had horrible track record.
Manticore's were a big improvement = worked well! Like the Metal Feed Lips.
Never tried PSA, so I can't say.
My Magpuls all work great, and have "milspec" feel about them.
The newer CZ's look much improved, but have never examined one.
I am now wondering about type of ammo used. Factory v. reloads, bullet weight/style, powder charge, type of brass....
I just made a huge batch of Scorpion food. Zero Bullet Company, 147 grain FMJ/Rn, 3.9 Grains of Unique powder, mixed range pick-up brass. They flew out of those Magpul mags - no problems.