FDM L4/L5

The L4 and L5, also called the Ribbon Gun, is a prototype, caseless, multi-bore selective fire rifle with an electronic firing system. The firearm was designed and built by Martin Grier, of Forward Defense Munitions, based in Colorado Springs, spending $500,000 in development. In 2018, The U.S. Army requested a prototype for testing as a potential replacement for the M16 rifle.^{[1][2][3][4][5][6][7][8]}

L4/L5
Type	Multiple-barrel firearm
Place of origin	United States
Production history
Designer	Martin Grier
Designed	2018
Specifications
Mass	6.5 lbs
Caliber	6mm
Action	Electronic
Feed system	4 or 5-round charge blocks