As far as im cocerned, you cant do that salim. There is no possible way to put guns onto your account and to make your account any rank without working (with hacks or without) to get that. ie. Exp hack.
im not a hacker or a programmer but as far as i know, guns are serversided. Which means you cant put any weapon on an account or change anything on about a weapon on an account unless ou have direct access to the server. (with an administrator account)
The fact is, people have been trying to find a way to do all this for years but to no avail. That being said, unless you show 100% proof that he can do that, you, my good sir, are a liar.