No. He hacked the files somehow or manipulated some memory to make many available. You only get a few weapons from store so you have max 16 weapons. 3 snipers ( Viper, Mantis, Widow), 3 Assault guns ( Avenger, Mattock and Revenant), all 4 SMG though ( the new Hornet, Shuriken, Tempest and Locust), 3 shotguns ( Katana, Scimitar and Claymore) and 3 heavy pistols ( Phalanx, Predator and Carnifex). Once you upgrade common guns to X, you then get very very rare upgrades for rare guns ( Widow, Revenant, Hornet, Claymore and Carnifex).
At least i got that from 200 veteran packs :D Maybe i'm wrong, but i'm not clicking to purchase things anymore. :D