This is an excellent example of a post-war production M37 machine gun. This model was developed in the late 1940s/early 1950s by SACO-Lowell and was basically an updated/improved Browning M1919 MG. Improvements were made to the bolt and feed mechanism that allowed it to be switched from a left to right hand feed, which made it a perfect candidate for use as both a coaxially mounted tank machine gun, primarily on the M48 and M60 Patton medium tanks, and also in a flex-mounted version as an infantry weapon when equipped with the standard iron sights mounted on top of the receiver and a tripod as in this example. It has the standard medium weight barrel with a perforated barrel jacket. This example is a "flex-mounted" version as it is equipped with the tangent rear sight and a rear mounted cocking lever/charging handle. The side of the receiver is marked: "No.30941 U.S. INSP/GUN, MACHINE, CAL .30 M37/U.S. PROPERTY/MFG. BY SACO-LOWELL SHOPS/ BA4 - 4/69". It comes with an original British issue M2 tripod mount, marked "F.T.R. 6-69 UE 68 A43/ 1005--00-650.7052" and a pintle.