M249 SINGLE POINT BUNGEE SLING – Bulldog Tactical Equipment
T3 AW Sling - T3 Gear
Vickers M249 SAW Sling
Airsoft LMG - Classic Army M249 Para [In-Depth Review] - Airsoft Ranch
Vickers M249 SAW Sling Black - BLUE FORCE GEAR
A&K M249 PARA SAW - Support Gun on a Budget | Airsoftology Review - YouTube
U.S. Military Surplus M249 LMG Weapon Sling - 708494, Gun Slings at Sportsman's Guide
M249 light machine gun - Wikipedia
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. :
Guarder M60/M249 Sling 2013 Version | Popular Airsoft: Welcome To The Airsoft World
Special Operations Combat Sling (SOC Sling) Tactical Rifle Sling by Sword and Shield Strategic | Sword and Shield Strategic