I thought the suppressor attachment to the barrel of the Alpha Jackal required the weapon the be maxed out. Just maxed out the weapon (says: "maximum level achieved") and the attachment is still unavailable.

Am I missing something?

i think the suppressor is a gamestop exclusive... it came with the stalker pack.

said it came with an exclusive silencer.. i thought it might've been different from the main silencer or something, but i guess it really is exclusive.