M4 Red Dot with Laser Black (Aim-O) - Reflex Sights - Optics and Target Acquisition - Airsoft Online shop - airsoftzone.com
UKArms M4 Spring Airsoft Rifle Gun With Red Dot Sight - Unlimited Wares, Inc
Second Life Marketplace - SCRIPTED Colt M4 Tactical Carbine MK21 TRANSFERABLE Assault rifle with tactical grip and red dot sight and rails
G&P M4 Type Red Dot Sight w/ 20mm Weaver QD Mount Base for Airsoft, Accessories & Parts, Scopes & Optics, Red Dot Sights - Evike.com Airsoft Superstore