UC-9 Barrel with 1:10” twist in the raw. USA New Century Arms UC9 Barrles 16” 9mm for your UZI build or replacement barrel.
These barrels are made for semi auto builds, and have the semi auto barrel dimension at the rear required to smaller than the full auto design barrels.
The UC-9 barrel is made from 4140 with a hardness of 28-32HRC.
4140 contains chromium and molybdenum and are therefore “chrome-moly” steels.
NOTE: This barrel is made for UC9 semi auto design. Most IMI and Action Arms 9mm Uzi’s are built with a different trunnion diameter AS well as feed ramp diameter and can only use IMI barrels semi auto barrels. Or you can turn these down to fit the IMI builds as they are slightly larger diameter than IMI but still smaller than machine gun barrels. There are also some IMI/Action arms/home built Uzi’s that use the full size diameter machine gun barrels. We have seen this on several IMI’s especially if they were originally built as a Pistol as they did not require 992r compliance parts which is why they can get away on pistols only using original SMG “sub machine gun” barrels.
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