Today's war gaming and first person shooters has advanced greatly from what it was 4 decades ago, and PLUG is planning to take it further. The single player is a large extensive storyline that allows the player to join multiple divisions of the PLUG military group and get behind the story of how PLUG was created. "Valentine" or Sergeant Curtis E. Love is a fictional character that created PLUG, after taking serious injuries from one of his missions in Russia secretly taking out a Soviet base. Other details for the campaign will be added later. The Multiplayer mode is going to be a mass multiplayer online, other details will be added.
A similar design to the M4/M16 family, this weapon has the same style of recoil. More info will be added tomorrow.
Okay, here's the deal. A practical magazine fed 40 mm grenade launcher would have a maximum ammo capacity of three in the mag, one in the chamber. The recoil is going to be pretty intense, and I'm not even sure that you could make a practical box fed grenade launcher using the direct impingement system of the M-16.
Perhaps you should look up Metal Storm or, if you want to be a little bit more original, have a look at the old Gryojet pistol and the 30 mm grenades that the Russians use. Perhaps you might be able to see a different way of doing this.