the hk pack conflicts with T+T. i'm fairly sure that is the problem.
im confused as to how you managed to get a version of T+T where there isnt any ammo display for the submachine gun. the only issue I've ever encountered with a fully vanilla T+T install is magnum ammo not correctly saving/updating when picking up ammo for it.
underneath is a download of a zip of all the T+T files I have, since the original download links dont work. i unfortunately do not have any of the skins - probably can get them off a different rtb archive, assuming that your broken copy was taken off an rtb archive.
http://puu.sh/tjZQ4/08b6481ca8.zip
thanks for the t+t packs, as for the smg ammo display problem... it was referring to the ammo display not updating when it fired lol
well it looks like some other addon was conflicting and this hk actually does work alongside with the t+t i have, wow! since the t+t links are borked ill upload it to the topic's main post
T+T is horribly buggy and outdated. I would suggest using Rykuta's revamp of T+T, it has reloading but unlimited ammo. It also works with HK without confliction.
what if i told you that link that i originally posted fixed most of t+t's problems except for the inventory slot ammo not clearing after getting an item added to your slot? why not try it out? obviously somebody has to fix most of t+t's known problems and gimmicks (im not the one who overhauled this t+t pack)