Videos tagged with AR-57 Upper Receiver

This guide details the installation of the AR-57 upper receiver onto a standard AR-15 lower receiver, enabling the use of the 5.7x28mm cartridge. It also covers a practical modification using a Magpul PMAG as a brass catcher, demonstrating how spent casings are ejected downward through the AR-15's magazine well. The information is presented with high authority by Military Arms Channel, a recognized firearms reviewer.

This video from Military Arms Channel demonstrates the AR-57 upper receiver on an AR-15 platform, chambered in 5.7x28mm. The host highlights the unique top-mounted magazine and downward ejection through the AR-15 magazine well, which also serves as a brass catcher. The demonstration is significantly impacted by YouTube's new policies, forcing the host to satirically cut away from showing loading and clearing procedures, while still showcasing live fire. The speaker's authoritative tone and familiarity with niche platforms and digital policies are evident.

This video from DemolitionRanch, hosted by Matt Carriker, explores the effectiveness of custom-made armor plates constructed from .45 ACP bullets and live cartridges encased in resin. The experiment tests various calibers, including .22 LR, 9mm, 5.7x28mm, 12 gauge buckshot, and 5.56x45mm, against these unique ballistic barriers. While some rounds are stopped or significantly slowed, high-velocity rifle rounds penetrate with deflection. The video also touches on firearm reliability issues, specifically with the AR-57 upper receiver.