ARMALITE INC M-15A4CB Built on the same popular platform of the M-15A4 Carbine. This new carbineprovides all the flexibility of a flattop top picatinny rail but nowavailable in the worlds most available cartridge. The 7.62x39mm cartridgeis the most readily available cartridge in the world; in fact the originalAK-47 was built to use this cartridge. But finally enthusiasts of thiscartridge won’t have to settle for less than the best. A true ArmaLitecarbine. The ArmaLite designed mid-length handguard and gas tube technologyprovides an optimal gas pulse to power the 16″ system so reliability isnever an issue.