Friendly Fire Rockets are a project on Kickstarter, which consists of foam projectiles, designed in two common sizes, for use in pressurized launchers. There’s a 40mm version for gas powered under-barrel grenade launchers and 1.5″ PVC barrels, and a 50mm version for 2″ barrels.
The intent of Friendly Fire Rockets is to provide Military, Law Enforcement, MilSim, Airsoft, and Paintball with a safe and effective method of “disabling” Op-For vehicles and/or buildings.