Apparently Ruben was not familiar with the Uzi magwell conversion. I find it very interesting that the price tag for the Uzi magwell conversion is $9,500. Yet they have an RPB M10/45 for $8,000 and Sam will do the Uzi magwell conversion for $400. I would think that someone will clue Ruben in as to market values. I don't own a standard M10/9. The magazines are expensive and need a loading tool. My two M10/9s, a RPB and a remanufactured TX gun, I bought already Uzi magwell converted. I think the Uzi magazines are easier to load and so much cheaper than any option of magazines for the factory 9mm configuration. Maybe some day I'll get around to a .45 Uzi upper, but I doubt it. The RPB M10/45 uses Grease Gun mags which is a higher capacity option than Uzi .45 caliber mags.
Scott