These are new production semi auto 9MM Mini UZI barrels with the HK 3-lug adapter. This is the only Mini Uzi barrel where the 3 lug adapter is machined as an integral part of the barrel. Can be used with your HK 3-lug mount suppressor. Includes a modified barrel nut. They are 1 in 10″ twist barrels that are machined then parkerized as called for on the IMI print. This is the propper barrel for IMI Mini Uzis with the semi auto style feed ramp and the SMG style trunnion.
All NFA rules apply. These barrels can only be legally used in a registered machine gun, registered Short Barrel Rifle (SBR) or a pistol. They can not be used in a standard carbine with a 16″ barrel unless you register your carbine with ATF NFA as a legal SBR.
Go see our friends at UZITALK for a wealth of information about Uzis.