I think we should be able to sell the MP7. I get it's importance to newer players who only have a pistol, but later when you get all the weapons you need it begins to become an inconvenience as it clogs up weapon/inventory space and doesn't do much damage.
Although its mostly useless, many guns have diferent cualities, maybe when you are out of ammo you use it, or for other situations, but that is not the point, this is probably a bug. because maybe it was made so you dont sell starter weapons and glitch or ruin flood...
The pistol with 9999 ammo? If you want to glitch/ruin the game that's your problem, what I'm saying is that it's sort of an inconvenience for players who have most/all guns. All that would needed to be implemented is a sell feature for it, problem solved.
I think you should be able to sell/remove the mp7. I suggest setting the cost of the mp7 to $0 so you cannot earn profit from selling and buy it back for free if you need it. The (unsellable) pistol is a weapon which has 9999 ammo covers both of these reasons. The mp7 does not have infinite ammo. If a player sold the mp7 and have no other guns, then all they have is the pistol. Its the player's choice to sell it, so I don't see why it would cause problems.
I don't completely agree with it, I am just quoting the owner. And the MP7 is a good way of doing damage, so you'll always have one good damage weapon.