German HK Semi UMP in 9 mm

Published on March 1, 2019
Duration: 22:57

This guide details the field stripping process for a 9mm UMP conversion, likely based on an HK USC. The process involves removing a single takedown pin, hinging down the trigger pack, and then extracting the bolt and recoil spring after partially folding the stock. The video emphasizes that these conversions are permanently modified for semi-automatic fire. The presenter, with experience in firearm modifications, guides viewers through the simple maintenance procedure.

Quick Summary

Converting an HK USC to a UMP style involves specialist gunsmiths like Tommy Built using parts from HK Parts.net. The 9mm UMP features a direct blowback action with a lighter bolt for reduced recoil and easier magazine loading compared to the .45 ACP version. Parts may show wear as they often come from demilitarized machine guns.

Chapters

  1. 00:09Introduction & USC Background
  2. 01:36.45 ACP UMP vs. 9mm UMP
  3. 02:22.45 ACP UMP Full Auto Shooting
  4. 03:029mm UMP Conversion Overview
  5. 04:01Tommy Built Conversion Process
  6. 04:21DIY UMP Build Options
  7. 05:09Vortex Red Dot Sight
  8. 05:269mm UMP Shooting
  9. 06:09Magazine Functionality
  10. 07:06Wear on Converted Parts
  11. 07:46Firearm Operation Controls
  12. 08:57Accessory Rails & Ergonomics
  13. 09:30Final Magazine Shoot
  14. 10:39Vortex Razor AMG UH-1 Review
  15. 14:36Red Dot Sight Usage (Both Eyes Open)
  16. 15:03Non-Reciprocating Charging Handle
  17. 15:58Magazine Loading Comparison (.45 vs 9mm)
  18. 16:59UMP 9mm Field Strip
  19. 18:25Reassembly
  20. 19:19Cost of UMP Builds
  21. 20:33DIY UMP Build Cost-Effectiveness
  22. 20:50UMP vs. MP5 Comparison
  23. 21:32Support the Channel
  24. 22:31Final Thoughts & Pack Up

Frequently Asked Questions

How is an HK USC converted into a UMP style firearm?

The conversion typically involves sending an HK USC carbine to a specialist like Tommy Built. They use parts from HK Parts.net, including a new lower receiver and internal components, to transform the USC into a UMP-style firearm. This process is often expensive and requires professional gunsmithing.

What are the key differences between the .45 ACP and 9mm UMP conversions?

The 9mm version uses a direct blowback action with a lighter bolt, making it feel lighter and reducing recoil. Magazine loading is also easier in the 9mm due to its true double-stack design, unlike the .45 ACP's staggered feed which requires more effort to load.

Can parts for UMP conversions be new or are they used?

Parts sourced from suppliers like HK Parts.net for UMP conversions are often derived from demilitarized machine guns. This means they may exhibit signs of wear, such as nicks, dings, and faded markings, which is normal for these types of components.

What is the Vortex Razor AMG UH-1 red dot sight and what are its features?

The Vortex Razor AMG UH-1 is a red dot sight with a reticle featuring a central dot for longer ranges and a chevron for close-quarters. It has 15 brightness settings, a 14-hour auto-shutoff feature, and can be powered by a CR123A battery or a rechargeable battery via a micro USB port.

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