1) 13 1/2" .300 Blk receiver with Vortex red dot sight, magnifier, angled grip, and light 2) 14 1/2" 5.56 NATO receiver with scope, hand stop, light, and laser 3) 8 1/2" .300 Blk receiver with red dot sight, and angled foregrip 4) 7 1/2" 5.56 NATO receiver with Leupold LCO style red dot sight, angled foregrip, light, and laser, bolt and charging handle absent.