I do think these are the best nfa uzi SMG.
Wow...really?
The Micro was my least favorite. I had a RR Micro and sold it several years ago. Mine was all factory correct with the proper sights, remarked etc...only thing I didn't have done was the bayo lug welded on.
I had it in open and closed bolt. Open bolt was never a factory thing for the Micro so left it in closed bolt 9mm which is crazy fast and really the Mini UZI and Micro UZI closed bolt assemblies are the same minus the Micro having the notch cut for the cocking lug so you get the same cyclic rate in the Mini as Micro for closed bolt. So if I ever miss the 1700 RPM cyclic rate I can always drop the closed bolt assembly into my Mini.
Caliber conversion are basically non existent on the Micro. You have them in 9mm and .45ACP and I don't think IMI ever made them in full auto .45 and even when they did do .45ACP they reinforced the rear of the receiver to handle the load.
The frame is so flimsy on the MIcro. I swear mine would flex in full auto suppressed. In semi it was fine unsuppressed but full auto it was bad.
I had a custom 22LR kit for mine and it was always iffy. I probably would have kept it if I had that 22LR running 100%.
For just 9mm, Mini is my favorite with the heavy bolt as I can still pull singles in full auto and as mentioned I can always go to the same insane cyclic rate as the Micro if I want to. I also have the 22LR bolt I used in the Micro that I use in the Mini and it works better in that than the Micro.