One other thing to do is remov the full auto grip.
If it has the correct angled trigger guard and you want that it's gonna cost ya.
They bring 450.00 and up on GB for a angled trigger guard grip.
Some of the pistols sold had the plain jane trigger guard also so while not looking the best it will do until the right one is sourced.
You would also want to replace the bolt with a bolt that is missing the lower feed lip.
Another way is to add a blocker to the lower grip to stop it from going to the FA position.
There are how to's here on the forum for converting a lower to semi use only and it's perfectly legal to do so.
Poof gun is now a legal semi auto.
For now I'd definitely lose the lower grip since it's what is converted.
Speaking of lower grip make sure it doesn't have either a registered or contraband KICKER in it.
A legal KICKER will be marked like any other NFA gun/part.
There is no slotted bolt on a mini or pistol UZI.
So easy even a caveman can do it.
ETA:
Some limited pistol conversion info