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Spraycan Weapon

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hello, hey I have a question about something, a moment ago I left a house to loot and I left groove street, at the johnnson house, and found a spray paint for grafitys, is it very rare to find this weapon?
This is kinda not possible by my opinion,because if you enter Ganton (the staff zone),you will be teleported out of it.

Also,this weapon is not purchaseable in my opinion.
The probability of finding a CJ's house is 73/230400.