I brought mine to the range yesterday for the first time. It is accurate out to 100yds, suprised the shit out of me!
The one mag that I currently have has a little (1/8") of play front to back. When the mag is pushed to the front, I get jams. The round hits the feed ramp and jams the bullet into the case causing a stoppage.
To cure this I hold onto the magazine and push it foreward, therefore keeping the feeding angle correct. I'll be adding a small spacer/wedge to the mag soon. Mabey today.
I've got three UZI hi caps at Oly arms right now. They are undergoing the conversion, hope they don't have the same problem.
FWIW, the mags are VERY tight in the magwell when they are new. It almost takes two hands to get them in and out. They do loosen up with use.
I think they are designed tight to avoid any play in the receiver.
I'm interested to know, does anyone have a OLY arms 45ACP upper that functions 100%? I think mine will after I get the bugs worked out.
However, my buddy brought his to the range yesterday (new bolt) and it was crunching brass like a champ. Seems his new bolt has a untuned ejector and its throwing brass back into the receiver where it gets crunched by the bolt.