How To Turn Your AR-15 Into A P90

Published on May 20, 2022
Duration: 9:04

This video demonstrates how to convert an AR-15 platform into a P90-style rifle using the AR57 ULT upper receiver. It highlights the 5.7x28mm caliber, the 50-round P90 magazine compatibility, and the benefits of bottom ejection for shooter comfort. The AR57's direct blowback operation and simple disassembly are also covered, showcasing its ease of maintenance and ambidextrous features.

Quick Summary

Convert your AR-15 to fire 5.7x28mm using the AR57 ULT upper receiver. It allows the use of 50-round P90 magazines and features bottom brass ejection, similar to the P90, for improved shooter comfort. The direct blowback system ensures simple disassembly and maintenance.

Chapters

  1. 00:00Intro: AR-15 vs P90 in 5.7x28mm
  2. 00:48AR57 ULT Upper Receiver Explained
  3. 01:19FN PS90 Overview
  4. 01:44AR57 Technical Details & Design
  5. 03:265.7x28mm Caliber & 50-Round Capacity Benefits
  6. 05:07Range Performance & Binary Trigger Test
  7. 06:39AR57 Disassembly and Maintenance
  8. 07:37Ambidextrous Features of the AR57

Frequently Asked Questions

How can I convert my AR-15 to shoot 5.7x28mm like a P90?

You can convert your AR-15 to shoot 5.7x28mm using the AR57 ULT upper receiver. This upper fits standard AR-15 lowers and allows you to use P90 magazines, effectively giving your AR-15 P90-like functionality.

What are the benefits of the 5.7x28mm cartridge in an AR-15 platform?

The primary benefit is the ability to use high-capacity 50-round P90 magazines without the bulk of traditional drum magazines. The 5.7x28mm round is also known for its low recoil and good performance.

How does the AR57 upper receiver eject brass?

The AR57 upper receiver ejects brass downwards through the AR-15's magazine well. This design is similar to the P90's bottom-ejection system and helps keep hot brass away from the shooter's face.

Is the AR57 upper receiver difficult to maintain?

No, the AR57 upper receiver features a simple direct blowback operating system. Disassembly is straightforward: separate the upper receiver and the bolt carrier group slides out easily from the rear.

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