As best I know, unless you want to convert to grease gun mags, the items you need are the bolt, barrel and mag.
For GG mags, you need the GG grip/mag holder also. The UZI 45 ACP mags are expensive but I'll use the IMI/AA conversion kit. I bought one NIB and paid a pretty steep price and have watched for the few good deals on the UZI 45 ACP mags.
OLE442