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.
You don't know what people can or can't do in this game. In 2009, no one thought "anti recoil" existed cause they've never seen it.
In 2010, no one thought "id blocking" existed and that people were just lying, not even ijji believed it and too add no one thought kita could hack accounts with just the username, but she obviously did, and she did too many people.
In 2011, no one thought "damage hacking" was possible
New hacks come to this game every year, it was just a matter of time before people could do this. And I'm pretty sure the unrealskills old hack had that you could get any weapon and some armor.