U.S. Military Surplus M249 LMG Weapon Sling - 708494, Gun Slings at Sportsman's Guide
BDS Tactical M249 Saw Sling | Free Shipping over $49!
Vickers M249 SAW Sling
This is the closest I can legally get to an M249 SAW. It's a civilian transferable lower with the MCR belt fed upper and the same trijicon scope that the SAW uses. :
Blue Force Gear® Vickers SAW Sling™ - YouTube
Blue Force Gear Vickers M249 SAW Sling Coyote Brown Features a larger pad in the rear and Nomex front webbing to prevent burn through VCAS-SAW-CB | Cheaper Than Dirt
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Vickers M249 SAW Sling
FN M249 Front Sling Mount Kit: MGW
Vickers M249 SAW Sling Coyote Brown - BLUE FORCE GEAR
Blue Force Gear Vickers M249 Saw Sling | w/ Free Shipping