Mine only ran good brass ammo until I opened up the port...and would still fail to lock on an empty mag on occasion. Wouldnt cycle steel cased ammo at all.
Runs perfect with the bigger port. Didnt lose any smoothness.
And when you loose your permit that covers every semi auto firearm you own because you have an unpaid parking ticket...or some crazy ex wife says you threatened her....you can look back and say "seemed like the best idea at the time"