I Built the MOST CURSED GUN EVER!!! Oh, and Finally SBR'ed My P90...

Published on May 23, 2023
Duration: 17:21

This guide details the process of building a unique bullpup AR-57 hybrid firearm by combining an AR-15 lower with a REAP Weaponries bullpup kit and a Panzer Arms AR-57 upper receiver. The build utilizes P90 magazines and fires the 5.7x28mm cartridge. The video highlights the experimental nature of such builds and touches upon NFA regulations for SBRs.

Quick Summary

The AR-57 bullpup hybrid is constructed using an AR-15 lower, a REAP Weaponries bullpup conversion kit, and a Panzer Arms AR-57 upper receiver, enabling it to fire 5.7x28mm rounds from P90 magazines. Testing revealed unique ergonomics and dual safety features.

Chapters

  1. 00:00SBR P90 Introduction
  2. 02:11The Cursed Gun Concept
  3. 03:21Building the AR-57 Bullpup
  4. 04:18Range Testing the Hybrid
  5. 08:50Fiocchi 5.7x28mm Ammo Overview
  6. 11:52Full-Auto Ballistic Gel Test

Frequently Asked Questions

What components are needed to build a bullpup AR-57 hybrid firearm?

To build a bullpup AR-57 hybrid, you'll need an AR-15 lower receiver, a REAP Weaponries bullpup conversion kit, and a Panzer Arms AR-57 upper receiver. This setup allows the use of P90 magazines and fires 5.7x28mm ammunition.

What are the key considerations when testing a custom bullpup firearm?

When testing a custom bullpup firearm like the AR-57 hybrid, pay attention to its ergonomics, the functionality of any dual safety mechanisms, and the trigger quality. Reliability and accuracy should also be assessed.

What types of 5.7x28mm ammunition were showcased?

The video showcased several Fiocchi 5.7x28mm ammunition types, including Range Dynamics FMJ, Hyperperformance Tipped Hollow Point, and Jacketed Frangible loads, each suited for different purposes like training or terminal ballistics testing.

What NFA regulations apply to firearms like the SBR'd P90?

Firearms classified as Short Barreled Rifles (SBRs), such as the P90 shown, fall under the National Firearms Act (NFA). Owners must comply with federal regulations, which typically involve registration, background checks, and paying a tax stamp.

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