I have uzi fa 22 conversion kits I'm trying to find out info on. I have not used these. I have had these at least 10 years. I know the 4 28 round mags came from vector and the 3 plastic mags are black dog. Both bolts are aluminum and 1 bolt is heavier than the other . The lighter bolt has a cutout along the top of the bolt. I thought 1 kit came from vector and the other is subgun Ordnance with the barrel turned down a little on the end? I have a mini uzi I'm getting and am going to start selling some items. This is not a for sale ad as I will put that in the for sale section once I know exactly what I have