Developed by Sig Sauer, the Sig MG 338 is primarily chambered in .338 Norma Magnum which has approximately twice the effective range of 7.62x51mm. It weighs approximately 22 pounds and has a short stroke gas piston operating system. It weighs significantly less than the preceding M240. It is select fire being capable of both automatic and semi-automatic fire. It uses an AR style handgrip and buttstock. It's in use by USSOCOM and being evaluated by the U.S. Army and U.S. Marine Corps.            