Stern Defense 45ACP AR-15 Conversion Kit Review

Published on February 19, 2020
Duration: 15:12

This guide details the installation and testing of the Stern Defense .45 ACP AR-15 conversion kit. The review highlights its reliability over 1,500 rounds, ease of installation using a magwell adapter, and compatibility with Smith & Wesson M&P 45 magazines. Accuracy testing at 50 yards showed group sizes between 1.25 and 3 inches.

Quick Summary

The Stern Defense .45 ACP AR-15 conversion kit provides a reliable way to convert an AR-15 to fire .45 ACP. Tested extensively with over 1,500 rounds in full-auto with zero malfunctions, it uses S&W M&P 45 magazines and features a 4150 CMV barrel with a 1:16 twist.

Chapters

  1. 00:00Introduction and Shooting Montage
  2. 00:31Product Overview
  3. 01:03Reliability and Testing
  4. 02:28Barrel and Muzzle Device
  5. 03:45Handguard and Upper Receiver
  6. 05:28Bolt and Buffer System
  7. 07:18Magwell Adapter and Magazines
  8. 09:33Hollow Point Testing
  9. 11:04Final Thoughts and Accuracy
  10. 12:57Accuracy Testing at 50 Yards

Frequently Asked Questions

What is the Stern Defense .45 ACP AR-15 conversion kit?

The Stern Defense .45 ACP AR-15 conversion kit allows a standard AR-15 lower receiver to fire .45 ACP ammunition. It includes a specific upper receiver, a magwell adapter, and requires a heavy buffer, converting the platform into an AR-45.

How reliable is the Stern Defense .45 ACP conversion kit?

The kit has been tested with over 1,500 rounds, primarily in full-auto, with zero malfunctions reported. This extensive testing suggests a high level of reliability for the conversion system.

What magazines are compatible with the Stern Defense .45 ACP AR-15 conversion kit?

The kit is designed to work with Smith & Wesson M&P 45 magazines. Glock .45 ACP or 10mm magazines are not compatible due to their width exceeding the standard AR-15 magwell dimensions.

What are the key technical specifications of the Stern Defense .45 ACP upper receiver?

The upper features a 4150 CMV steel barrel with a Melonite finish and a 1:16 twist rate. The bolt is constructed from 8620 steel with a nickel boron finish, and it operates on a straight blowback system.

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