You cannot add "HK G36 G36K Length Foregrip Handguard Surefire PD Trade-In" to the cart because the product is out of stock. HK UMP/USC Picatinny Optic Top Rail Trade In$3900 SKU: UMPRLTOP01 Categories: Services HK USC to UMP, UMP G36 Tags: UMP, usc Product ID: 4275 Picatinny/1913 accessory top optic rail for HK UMP and USC. High quality aluminum, black anodized, with screws. Fits HK UMP and USC as well as in spec clones. PD Trade in/Used Rail Black Anodized Aluminum Product is out of stock Notify me when this product is back. Please enter a valid email! Subscribe Description Additional information Description Picatinny/1913 accessory top optic rail for HK UMP and USC. High quality aluminum, black anodized, with screws. Fits HK UMP and USC as well as in spec clones. PD Trade in/Used Rail Black Anodized Aluminum Additional information Weight 2.5 oz Dimensions 7 × 1 × 1 in Manufacturer Black Ops Defense Related products Out of stock HK G36/SL8 Full Length Handguard With Picatinny Accessory Rails $14900 Out of stock HK G36 Factory Dual Optic Top Rail $99900 Out of stock HK G36K Complete Parts Kit Trade-in/De-milled $2,49900 Out of stock HK USC/UMP 45 8″ Threaded Factory Barrel $49900