New U.S. 76/760 barrels from BWE Firearms. ls are made to factory specifications. They are 8″ long with a 1 in 10″ twist 9mm barrels that are machined then parkerized.
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.