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 creating a unique hybrid firearm by mating a Panzer Arms AR-57 upper receiver, chambered in 5.7x28mm, to an AR-15 lower receiver fitted with a REAP Weaponries bullpup conversion kit. The video highlights the experimental nature of this build, involving collaboration with other firearm personalities and testing on the range. Expert insights are provided on the assembly and handling of this custom platform.

Quick Summary

This video details the construction of a custom AR-57 bullpup hybrid using a Panzer Arms upper and REAP Weaponries bullpup kit on an AR-15 lower, alongside an FN P90 SBR build. It explores 5.7x28mm ammunition from Fiocchi and discusses the unique aspects of these experimental firearms.

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 is involved in building a custom AR-57 bullpup hybrid firearm?

Building this hybrid involves mating a Panzer Arms AR-57 upper receiver, chambered in 5.7x28mm and using P90 magazines, to an AR-15 lower receiver that has been modified with a REAP Weaponries bullpup conversion kit. It's an advanced DIY project requiring specific components and knowledge of firearm assembly.

What are the key features of the FN P90 SBR discussed in the video?

The FN P90 is shown in its Short Barreled Rifle (SBR) configuration, featuring a suppressor and red dot optic. This modification reduces the barrel length, making the firearm more compact while requiring NFA compliance and a tax stamp.

What types of 5.7x28mm ammunition were tested?

The video highlights Fiocchi 5.7x28mm ammunition, specifically mentioning Range Dynamics FMJ, Hyperperformance Tipped Hollow Point, and Jacketed Frangible loads. These were tested for their performance characteristics, including terminal ballistics.

What are the potential challenges when building and testing a custom bullpup firearm?

Challenges include navigating the unique ergonomics of bullpup designs, managing dual safety mechanisms if present, and ensuring reliable function with specialized upper receivers and ammunition. Proper NFA compliance is also critical for SBR builds.

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