Delivering a heavy-hitting .30 caliber round on target .300 BLK was originally designed around being a subsonic round for use in shorter barrel suppressed rifles. Additionally .300 BLK set out to utilize as many M4/AR15 parts and ammo components as possible. Although great for home defense and suppressed use in subsonic loadings .300 BLK has evolved into a serious challenger to other intermediate cartridges like 7.62x39mm in supersonic form. Whatever your intended use may be this RESOLUTE in .300 BLK built on the Mk4 AR15 platform features modularity and craftsmanship like no other. - When full-size rifles are too cumbersome and pistols/SBRs don