Lets clear that up.
1. to get weapons to grove street, you have to spray all 100 tags (you wont get anything for 99, the weapons will be delivered when you spray tag #100)
2. to get the weapons to the 4 dragon casino, you have to collect all 50 horseshoes. 49 wont bring you anything.
Gamefaqs.com has some nice accurate location maps. Was pretty easy to collect them (only the oysters sucked ass, as they are all under water)