Depends upon your type of Uzi. If you have a registered receiver gun, you can easily drop in a new bolt and bbl setup & you're off to the races. If you have a registered bolt gun, then you're can't easily change calibers. You would need to find another registered bolt in the caliber that you want to shoot. This would require another $200 tax as the bolt, not the receiver, would be the registered item.
danbrew :->
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