The CMMG MkW-15 in .458 SOCOM is a large-bore AR-15 pattern rifle using an oversized receiver to accommodate the .458 SOCOM cartridge in a semi-automatic platform. The .458 SOCOM was developed as a heavy-hitting short-range cartridge for special operations use in AR-15 platforms, providing significantly more terminal energy than .45 ACP or .300 Blackout. The MkW-15 provides the most reliable .458 SOCOM operation through careful gas system tuning. Type: Rifle Action: Semi-Automatic Caliber: .458 SOCOM Capacity: 7 Year introduced: 2015, USA Weight: 112 oz Overall length: 36.5" Status: Active Intended use: Special Operations / Hunting