General Dynamics Armament and Technical Products (GDATP) is currently developing the XM307, a lightweight, portable grenade machine gun that utilizes 25mm airbursting ammunition. This next-generation replacement for current heavy and grenade machine guns efficiently manages recoil and is highly portable in small soldier units. The system can be quickly and easily converted to a 12.7mm machine gun. GDATP is the prime contractor with total system integration.
Specifications
System
Weight 50 Pounds (19.05 kg) (Gun, Mount, and Fire Control)
Fire Control Full Solution, Day/Night
Portability Two-Man Portable & Vehicle Mountable
Stability Up to 18-Inch Tripod Height
Environmental Operationally Insensitive to Conditions
Gun
Dimensions 9.9Wx7.2Hx52.3L max inches (43.3L charged)/
251.46x182.88x1328.42mm (1099.82 charged)
Rate of Fire 250 Shots per Minute, Automatic
Dispersion Less than 1.5 Mils, One Sigma Radius
Range Lethal and Suppressive Out to 2,000 Meters
Ammunition High-Explosive Airbursting, Armor Piercing, and Training Ammunition (HE, AP, TP, TP-S)
Feed System Weapon-Mountable Ammunition Can (Left Feed)
http://www.gdatp.com/products/lethality/xm307/xm307.htm