The stag 15 retro offers a reproduction of the classic m16a2 models with a few modern upgrades.It is built around a 4140 steel, chrome-moly heavy profile barrel with a2 flash hider and a 12" thermoplastic handguard with double heat shields to provide better heat mitigation.The rifle-length gas system is partnered with an a2 front sight, and an m16 manganese phosphate, chrome lined bolt carrier group.The retro is completed with a rugged and durable a2 buttstock and pistol grip, removable a3 carry handle, and picatinny rail.This 5.56 nato model has a 20" barrel and a black hardcoat anodized finish.Battery: CR1632Magnification: 1xObjective: 28x18mmEye Relief: UnlimitedDot Size: 5 MOALength: 2.30"Weight: 4.90 ozFinish: Black MatteReticle: Illuminated Red DotAdjustment Size: 1 MOAProofs: Water ResistantOptic Coating: AR RedWindage Elevation: 100 MOA