D Boy M203 Grenade Launcher
The D Boy Full Metal 3in1 M203 Grenade Launcher (Long) is the most well rounded launcher in airsoft. This M203 launcher will mount to any standard 20mm rail, or it can be barrel mounted to real gun style delta ring AEGs and Tokyo Marui style delta ring AEGs. This is possible because D boy provides different mounts with the launcher. Depending on what gun you have you could mount this M203 launcher to any M4/M16 on the market.