HK USC UMP Conversion Custom Build/Preorder

From: $3,99900

SKU: UMPWLD-1 Categories: , Tags: , Product ID: 9860

Pre-order item / not available for immediate shipping

This is an HK USC 45 that has been converted to a UMP 45 using the “full weld-on” conversion technique and factory HK UMP parts. The build was done by Black Ops Defense to our highest quality standard!

The UMP machinegun parts were refurbished and reused to build this all HK parts, semi-auto version of the HK UMP. Features include the rear hinge weld on service, stock catch, UMP model name re-mark, folding stock, vent slot machining and 4 piece picatinny rail set.

Shown in possible SBR configuration. Pricing includes unmodified, USC 16″, 45 barrel. Contact us for customization and other options.


Some images show possible configurations with and without barrel extensions, custom engraving, accessories, etc… ( optics and other unmentioned accessories not included )

(See below for additional information)

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Product Quantity

Additional Service: NFA/SBR Engraving


Additional Service: USC Barrel Work

USC barrel threading and cutting.


HK UMP 40Cal Conversion Kit Bolt and Barrel

Factory HK UMP .40 Cal. bolt and barrel. Full auto parts kit. Will work with UMP machineguns or with semi auto conversions ( USC, Omega, etc… ) with additional bolt machining. See options/selections.

Out of stock


Shipping Case Options


Optional Shipping Insurance

Set value package insurance, if you'd like to add it. This is optional. All packages will ship with tracking and signature confirmation regardless.


Out of stock



  • Complete USC 45 receiver
  • HK UMP parts kit (demilled machine gun)
  • HK USC factory bolt group
  • HK UMP factory lower housing/trigger group, semi-auto converted
  • HK UMP folding stock
  • Factory 16″ .45 Cal barrel ( short barrel options shown )
  • Picatinny top rail
  • Picatinny foregrip rails x 3
  • US made 25rnd magazine


  • .45 Cal
  • Fully welded/rebuilt ( rear hinge weld-on ) in house by Black Ops Defense
  • UMP model name re-mark
  • UMP foregrip vent slot machining
  • Machined to accept hi capacity magazines
  • Stock catch/hook addition
  • NFA engraving for form 1, SBR tax stamp options available
  • Short barrel and caliber options available
  • Fake suppressor barrel shroud option available
  • Contact us to add CA compliance


Additional Instructions:

  • Please have your dealer E-MAIL a photo or scan of their FFL for the transfer.
  • If you are sending your receiver back for markings after transfer, please E-MAIL a photo or a scan of your ID for our records. Contact us if your shipping address is different than your ID to confirm.
  • Indicate your return shipping address in the "shipping address" section during checkout, and include your dealer's address and FFL in the "dealer section", if available.
  • All firearms will ship with signature confirmation ( insurance is extra, see work order options )
  • Shipping fee overcharges will be refunded once we know your actual shipping cost, if applicable.
  • Add NFA engraving info, date codes, or other project details to the "notes" section during checkout (on the credit card processing and check out page).

Additional information

Weight 250 oz
Dimensions 42 × 12 × 6 in


Additional Service: USC Barrel Work

Length and Thread Pitch

8" Length .578 x 28 Thread, 16" Length .578 x 28 Thread, 8" Length 16 x 1mm Thread, 16" Length 16 x 1mm Thread, Custom

HK UMP 40Cal Conversion Kit Bolt and Barrel

922r Qualifying Part

YES – Foreign



Unmodified ( Factory UMP ), Semiauto ( Bolt Machining, USC )

Shipping Case Options

Choose One

Customer Supplied Shipping Case, Tactical Soft Case, Plano Case & Accessories, Eylar Case & Accessories, Pelican Case & Accessories

Optional Shipping Insurance

Shipping Insurance

No Insurance, 1000$ Insurance, 2000$ Insurance, 3000$ Insurance, 4000$ Insurance, 5000$ Insurance

Minimum 4 characters