For Mods and Supervisors: category icon will be created soon, I promise :)
The MP7 is a member of a relatively new class of small arms, called Personal Defense Weapons. The PDW are intended, as name implies, to be a defensive sidearm for second-line troops, vehicle crews and other military personnel who normally not issued with assault rifles. Could be fired single-handedly, or using both hands, either like the pistol or using a front grip.
Warning! Do not forget: there's no such weapon in the original game. It is completely new, separate weapon, and it doesn't change any of existing ones (that's why it's placed in the new category). In order to play with it, you need to use test spawn script (included in the archive) or ask the mod authors to implement it in the future releases.
All releases in this category must contain (at least) the test spawn script. It can be found in gamedata\scripts folder and allows you to get MP7A3 from Wolf after the first task briefing.
Feel free to re-release it with custom sounds, skins etc.
But for love of God, do not forget to properly write all credits.