Special Operations Padded Sling for SAW M-249/M60-3307
FN M249 Front Sling Mount Kit: MGW
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 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
Vickers M249 SAW Sling Coyote Brown - BLUE FORCE GEAR