Brethren Arms MP5 in .300 Blackout (Teaser)

Brethren Arms is a small manufacturer making H&K-style rifles entirely here in the US. In addition to recreating original German rifles, Brethren is putting a lot of work into modernizing the designs and adding elements that make them more relevant today (like adjustable locking wedges, AR-compatible triggers, integral mounting rails, etc). A prime example of this is their creation of an MP-5/HK-53 sized rifle chambered for .300 Blackout. It's a great compact package that retains far more ballistic potential than a similarly sized .223.