The People who made Americas Army (An army recruitment tool) said that the only thing that affects lag is the servers ping, not yours, and even though people will blame bad lag on you because you have a high ping, in reality your ping isnt affecting them at all and its there and the servers fault for the lag that they are experienceing
And i dont remember how to unlock weapons in single, you have to change something
You have to change
0, 0, 0, 0, 0, 0 to 1, 1, 1, 1, 1, 1
I cant remember what file it is in though, sry, but ill try to find it