Check the listing for details. Us Gi Cover Replacement Barrel Caliber .50 Green Canvas 7964436. Color: Green, Condition: New other (see details), Made in United States. Listed at 23.84 USD. This cover (English: Spare Barrel Cover) is a classic piece of equipment of the United States Armed Forces (USGI), specifically designed for the safe transport and protection of the spare barrel of the heavy machine gun Browning M2 (.50 caliber) was developed. Protection: It protects the precise replacement barrel from dirt, moisture and mechanical damage (scratches) during transport in the vehicle or in the field. Heat resistance: The canvas material is heat resistant to a certain extent, which is important if you need to store a barrel that is still warm (although ideally you should let it cool down). Today this article is mainly at militaria collectors, reenactment groups or owners of historical military vehicles (such as the Humvee, Jeep or M113) to complete the on-board equipment. Sin.