The Marine Corps wants a 30 percent weight savings over existing linked belts of .50 caliber ammo.
Maternal Instinct: Why the Ma Deuce .50 Caliber Machine Gun Still Dominates - ITS Tactical
Lock & Load! - Military Trader/Vehicles
USA 0.50/90 (12.7 mm) M2 Browning MG - NavWeaps
Ammunition
DVIDS - News - Polymer ammo: A lightweight approach to support the warfighter
Armaments Innovation - The Over-Under Mortar/Machine Gun Naval History Magazine - August 2018 Volume 32, Number 4
Machine gun rounds hi-res stock photography and images - Page 2 - Alamy
SOCOM And The Marines Are Looking For A Brand New Long-Range Machine Gun - Task & Purpose
SOCOM and Marine Corps move closer to Ma Deuce replacement
Ammunition
SOF shooters are about to get serious upgrades for small arms, ammo