I sold it one day and It wont come back to the gun runners store. How can I get it back?

You'll have to reload a save probably, since you are on the ps3. If its already gone from the vendor you sold it too, its gone for good I think.

Yep,i Baught it.............and i Keep it

I just bought gun runners arsenal...I have the ultimate edition but I'm hoping this works

Don't items from vendors re spawn after 30 days in game? I may be wrong but maybe wait a while and see if the vendor has it again.