I was shooting supers out of a 7.5" with regular pmags just fine before I tried the other ones. They do feel smoother and a better fit in 300 blackout magazines. There is definitely a difference with the internals.

When I was researching them it seemed like the people who made the switch were having issues with their specific build and ammo types. Mostly with sub sonics. Someday my suppressor will come home and I'll have a chance to find out for myself.