DIY Gunsmithing Upgrade: AMT Backup

Published on December 11, 2025
Duration: 14:12

This guide details a comprehensive gunsmithing project to upgrade an AMT Backup .380 ACP pistol. Experts Brent T. Wheat and Roy Huntington demonstrate how to enhance comfort and shootability by de-burring sharp edges, bead blasting the slide, installing an XS Big Dot front sight via a milled dovetail, and re-cutting the barrel crown. The project highlights advanced techniques for improving a classic pocket pistol.

Quick Summary

This gunsmithing guide details upgrading an AMT Backup .380 ACP by de-burring sharp edges for comfort, bead blasting the slide, milling a dovetail for an XS Big Dot front sight, and re-cutting the barrel crown for potential accuracy improvements.

Chapters

  1. 00:00Introduction to AMT Backup Project
  2. 02:00De-burring and Polishing Sharp Edges
  3. 03:47Bead Blasting the Slide
  4. 04:46Selecting the XS Big Dot Sight
  5. 05:46Milling the Dovetail for the Sight
  6. 08:30Installing the XS Big Dot Sight
  7. 09:57Barrel Crowning for Accuracy
  8. 10:39Final Review of Upgrades

Frequently Asked Questions

How can I make my AMT Backup .380 ACP more comfortable for pocket carry?

To improve pocket carry comfort, focus on de-burring and smoothing the sharp edges of the AMT Backup's slide using tools like a bench grinder and polishing wheel, as demonstrated by experts.

What is the best way to upgrade the sights on an AMT Backup pistol?

Upgrading the sights on an AMT Backup typically involves milling a dovetail into the slide using a machine like a HiTorque mill and then installing a sight such as the XS Big Dot, often secured with JB Weld.

Can barrel crowning improve the accuracy of an AMT Backup?

Yes, re-cutting an 11-degree target crown on the barrel, as shown in this gunsmithing project, is a technique that can potentially enhance the accuracy of firearms by ensuring a more consistent bullet exit.

What tools are needed for an AMT Backup gunsmithing project?

Essential tools for this AMT Backup upgrade include a bench grinder, polishing wheel, bead blasting cabinet, a milling machine for dovetails, a barrel crowning tool, and adhesives like JB Weld for sight installation.

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