Brethren Arms MP5 in .300 Blackout (Teaser)
This is a teaser video for the Brethren Arms MP5 chambered in .300 Blackout. Brethren Arms is highlighted as a US manufacturer focused on H&K-style rifles, with a strong emphasis on modernizing classic designs. Features mentioned include adjustable locking wedges, AR-compatible triggers, and integral mounting rails. The .300 Blackout chambering is presented as a compact option with significant ballistic potential compared to .223 in similar-sized platforms.













