dawg180
Ar-15 Guru, Uzi Novice
If someone is hardup for a mag block with the boolt stop feature, Garrison Mfg was making them, at least sometime in the recent past. The only downside is that you have to use their dedicated bolt catch in place of the normal one which means no conversion to 5.56, at least not at the range.
Sadly I have a VMHytech block, Uzi mags, but no 9mm upper!
Sadly I have a VMHytech block, Uzi mags, but no 9mm upper!