Umarex HK UMP 400rd HI-CAP Magazine Marker Upgrades Alpha Black boasts an in-line

Alpha Black boasts an in-line bolt system

5") - 915mm (36") (Adjustable)Weight: 2

Full Metal Polish Finish

Material: Full Metal Upper & Lower Receivers

the Exalt Thumbscrew features an aluminum anodized oversized knob atop tough steel threads to guarantee durability and longevity in the field

Umarex HK UMP 400rd HI-CAP Magazine Marker Upgrades Alpha Black boasts an in-lineIf you're an HK UMP AEG user and all about a high round count, you better grab a few extra 400 round high capacity magazines to keep those rounds headed down range. Our 400 round, HK UMP AEG magazines are made of high quality polymer, so they don't weigh much yet hold up well under rough conditions. No one likes running short on ammo, so be sure to pick up a few extras for your HK UMP AEG before you head out to the field.