Hughes Tool Company

Short Recoil

40mm XM175 Grenade Lanncher Unassembled

Description and Purpose

The 40mm High Velocity XM175 Grenade Launcher is a lightweight, short-recoil operated, automatic weapon that fires the high velocity series of 4<)mm grenade ammunition at a rate of 350 rounds per minute. The grenade launcher is self-powered, belt-fed using metallic links, and percussion fired. The launcher can be assembled for either left-hand or right-hand feed without additional parts. The receiver is equipped with a folding leaf-type rear sight and a guarded post front sight. For normal operations, the launcher is pintle-mounted, and a lightweight flexible chute conveys linked ammunition from an ammunition box to the feed tray. Both ends of the teed chute arc provided with quick-release fasteners for case of connection. The feed chute contains approximately 20 rounds of ammunition when loaded, and a second length of ammunition can be linked to the first to provide a total of40 rounds at the ready condition.

Cycle of Operation

When the trigger is depressed, the sear retaining the bolt is lifted sufficiently to disengage from the bolt, allowing the bolt assembly to be driven toward battery by the drive springs. As the bolt advances, it delinks a round from the belt and rams it into the barrel, stripping back the link on the round approximately 1% inches.

When stripping is completed, the forward end of the bolt strikes the aft end of the barrel lock, causing it to rotate and release from the rear buffer ring. At the same time, the bolt locks drop in front of the barrel lugs and lock the barrel and bolt together; the unit now accelerates toward battery. Just prior to reaching the battery position, the bolt hammer contacts the actuating rod, causing the hammer to rotate and strike the firing pin. The round fires and initiates the recoil of the barrel and bolt. During the first 2.0 inches of recoil, the feed cam attached to the barrel •cocks the feeder by means of the feed lever. At a point 2Va inches aft of battery, with recoiling bolt assembly, the cam plates move the bolt locks out of engagement with the barrel lugs and enable the barrel to separate from the bolt.

When the barrel contacts the front buffer ring, the buffer is compressed and absorbs the energy of the barrel. At the same time, the initial overtravel of the barrel forces the barrel lock to be cammed up by the barrel lock cam. Upon counterrecoil of the barrel, the barrel lock strikes the rear buffer ring and retains the barrel in this position for the next cycle. The bolt

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