That was my experience with 22 kits for my uzi and my M11/9. I never got either kit to shoot an entire mag without jamming. You have to keep the mags clean and use high velocity 22 ammo. Lage tuned the M11/9 kit -- it made no difference.
Best thing about them is they're easy to get rid of.
I have not had good luck either. I owned:
MAC10 Practical Solutions kit, ran like crap, gave up, sold it
UZI Original Vector kit, ran like crap, gave up, sold it
M16 RTB 22 upper and every 22 gizmo that Bore Buddy sells, runs like crap, haven't sold it yet but the allergens are in the air
I read every bit of information on the internet about getting the UZI and M16 kits to run, and nothing helped.
I don't know why I couldn't get them running.
The little mods that are suggested to get the kits running are usually pretty simple. Like clipping a few coils off a spring. They don't seem like things that could be done poorly, even by a newbie.
So I figure that either
1. I was unlucky and just got some firearm and kit combinations that are just not going to run no matter what.
2. I lack the diagnostic skill to get them running properly.
It might a combination of 1 and 2. Maybe they were hard cases that could be made to run by an expert.
My M16 is a conversion that was done in the early 1980s, maybe the dimensions on it are wonky enough that it needs some expert tweaking to get it to run.