This USA AIMS-74 4150V barrel was a direct copy from a factory original Romanian Military AIMS-74 take off. These feature the handguard retainer cuts, and extractor cuts!
The MFG used Green Mountain 4150V true spec 5.45x39 blanks for these barrels.
Gas port is not drilled so you will need to complete the hole with the #48 drill bit we sell
Standard barrel trunnion press diamter is .908/23mm.