Aero Precision's M5E1 upgrades the M5 with integrated trigger guard geometry borrowed from the M4E1 lower, and compatible with Aero's M5E1-specific handguard system. The most recent and refined version of Aero's .308 AR platform. Type: Rifle Action: Semi-Automatic Caliber: .308 Win Capacity: 20 Year introduced: 2019, USA Weight: 112 oz Overall length: 36.5" Status: Active Intended use: Long Range, Service, Hunting