Additional Service: UMP Auto Bolt Machining$14900 Category: hide-from-search Product ID: 6781 UMP full auto bolt machining for use with semiauto builds. NOT required for the USC or other semiauto bolt groups. Additional Service: UMP Auto Bolt Machining quantity Add to cart Description Additional information Description UMP full auto bolt machining for use with semiauto builds. NOT required for the USC or other semiauto bolt groups. Additional information Weight 36 oz Dimensions 7 × 4 × 3 in Related products Sale! HK UMP 10mm Conversion Kit Bolt and Barrel from: $69900$49900