How To Turn Your AR-15 Into A P90

Published on May 20, 2022
Duration: 9:04

This guide details the process of converting a standard AR-15 lower receiver into a 5.7x28mm firearm using the AR57 ULT upper receiver. The AR57 ULT allows the use of P90-style magazines and the 5.7x28mm cartridge, offering a unique shooting experience. The conversion is presented as a straightforward upper receiver swap, making it accessible for intermediate DIY enthusiasts.

Quick Summary

The AR57 ULT upper receiver allows for the conversion of a standard AR-15 lower receiver to fire the 5.7x28mm cartridge using P90-style magazines. This modification offers a unique shooting experience with high capacity and low recoil, while retaining familiar AR-15 controls.

Chapters

  1. 00:00Introduction and Range Demo
  2. 00:48The AR57 ULT Upper Receiver
  3. 01:19FN PS90 Overview
  4. 01:44AR57 Technical Details
  5. 03:26Caliber and Capacity Benefits
  6. 05:07Range Performance and Binary Trigger
  7. 06:39Disassembly and Maintenance
  8. 07:37Ambidextrous Features

Frequently Asked Questions

How do you convert an AR-15 to fire 5.7x28mm?

You can convert an AR-15 to fire 5.7x28mm by installing an AR57 ULT upper receiver. This specialized upper replaces the standard AR-15 upper and allows the use of P90-style magazines and the 5.7x28mm cartridge, effectively transforming the platform.

What are the benefits of the AR57 ULT upper receiver?

The AR57 ULT upper receiver allows AR-15 owners to shoot the 5.7x28mm cartridge, utilizing high-capacity P90 magazines. It features a direct blowback system and bottom ejection, keeping brass away from the shooter and simplifying operation.

What caliber does the AR57 ULT upper receiver fire?

The AR57 ULT upper receiver is designed to fire the 5.7x28mm cartridge. This is the same caliber used in firearms like the FN PS90 and FN Five-seveN pistol.

Is the AR57 ULT upper receiver compatible with all AR-15 lowers?

Yes, the AR57 ULT upper receiver is designed to fit standard AR-15 lower receivers. It retains standard AR-15 controls such as the stock, grip, safety, and trigger.

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