The amazing 5.7 AR15

Published on October 29, 2023
Duration: 0:44

This review details the AR-57 upper receiver, a conversion for the standard AR-15 platform chambered in 5.7x28mm. It highlights the unique top-mounted P90 magazine system and a clever downward ejection modification using a cut Magpul PMAG to catch spent brass. The demonstration confirms the effectiveness of this brass-catching hack.

Quick Summary

The AR-57 upper receiver converts an AR-15 to fire 5.7x28mm using top-mounted P90 magazines. It ejects brass downward through the magwell, enabling a hack using a modified PMAG to catch spent casings.

Chapters

  1. 00:00AR-57 Upper Overview
  2. 00:16Downward Ejection & Brass Catching
  3. 00:34Live Fire Demonstration

Frequently Asked Questions

What caliber does the AR-57 upper receiver fire?

The AR-57 upper receiver is designed to fire the 5.7x28mm cartridge, offering a unique caliber option for the AR-15 platform.

How does the AR-57 handle magazine feeding?

It utilizes FN P90 style magazines, which are uniquely mounted on top of the handguard, deviating from traditional AR-15 magazine placement.

What is the ejection system of the AR-57?

The AR-57 ejects spent casings downward through the AR-15's magazine well, which allows for a clever brass-catching modification.

Can you catch brass with the AR-57?

Yes, by using a modified Magpul PMAG with the top section removed, spent 5.7x28mm brass can be effectively caught within the magazine body.

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