add to weapon_restrict.cfg
Code:
// -1 = unrestricted, 0 = restricted, positive numbers = number allowed for Counter-Terrorists. Weapon:usp
// -
// Default: "-1"
sm_restrict_usp_ct "-1"
// -1 = unrestricted, 0 = restricted, positive numbers = number allowed for Terrorists . Weapon:usp
// -
// Default: "-1"
sm_restrict_usp_t "-1"