My understanding based on hearing discussions from other Uzi SMG owners is that +p and +p+ function very well in the open bolt uzi. Closed bolt semi auto versions should not shoot +P.
In my Uzi SMG I run a steady diet of 4.3 grn Titegroup under a 124grn jacket bullet. 4.4 grn is considered max in the manuals I have consulted so it's a warm load. I have not tried +p ammunition but would not be afraid to.
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