You will receive 12 of each pistol and revolver available in-game including all assault pistols, and more. You'll receive 960 weapons total. Each gun will have 999 ammo, reload to 999, max stats and instant reload.
 
With trunk delivery straight to your locker you will receive all of your items in minutes. 
 
You will need to complete bounties for some of these items before you can use them.