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UM DBM (Detachable Box Magazine) AND MAG


All-new Detachable Bottom Metal and Magazine Design!

UM DBM AND MAG design allows for cartridges to be loaded out to a length of 3.950″ to take full advantage of their performance. Cartridges like the 28 Nosler, 300 PRC, 300 RUM, 338 Lapua, and 338 Edge are vastly improved with this new magazine length.

UM Long DBM with CIP Mag (3.800″ Inside mag length)

UM Long DBM with XL Mag (3.950″ inside mag length) works with BAT Machine actionsDefiance “Seekins Cut” actionsPierce Engineering Actions 4″ Cut actionsTerminus Kratos X actionLone Peak 4″ Cut actions


Long Action only

Compatible with all BAT 4″ Cut Long Actions, Defiance “Seekins Cut” Actions as well as Remington 700 Long actions (Modifications to the Remington 700 Long Action receiver, bolt stop, and stock will be required.)

  • All parts are 6061 Aluminum, fasteners are stainless steel.
  • 3 Round Center Feed for both Ultra Mag and Lapua
  • Inside mag length of 3.950″
  • M5 Long Action footprint (stock will need minor inletting for fitment)
  • Side Release Lever
  • Cerakote black and gray as pictured in house.

Defiance Actions – (

Remington 700 Actions – (

Remington 700 & Christensen Stripped Actions – (

Long Action Magnum – (

Bat Machine Co. precision rifle actions, machining & tooling

Actions – Defiance Machine | Custom Bolt Rifle Actions

Great tutorial below to show what 700 receivers require to use this DBM:


DBM Only, CIP 3.800 Magnum Magazine, CIP 3.800 Lapua Magazine, XL 3.950 Magnum Magazine, XL 3.950 Lapua Magazine


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