Hogue branches into the Class III arena by introducing an exciting machine gun accessory. Use of bulky clothing and/or body armor while functioning the H&K UMP presents an awkward Length-of-Pull difficulty with an otherwise excellent firearm. The Hogue Buttstock Adapter installs easily and solves this ergonomic problem by allowing use of any M-4 type collapsible buttstock. This durable adapter is constructed from hard anodized 6061 billet aluminum and is carefully designed consistent with natural cheek placement characteristics. It's unique hinge quickly and easily folds for storage, yet clears ejection port and allows for convenient field stripping. Use of the Hogue UMP buttstock adapter yields a substantial increase in effective utility.