Omega Manufacturing produces retro-specification AR-15 and M16 configuration rifles in the original A1 configuration — slabside lower receiver, birdcage flash hider, round handguards, fixed A1 stock, and period-correct details. The semi-auto-only M-16A1 retro represents nostalgia for the original Vietnam-era configuration that defined the AR-15 for a generation. Type: Rifle Action: Semi-Automatic Caliber: 5.56x45mm NATO Capacity: 20 Year introduced: 2018, USA Weight: 96 oz Overall length: 39.5" Status: Active Intended use: sporting, collector