Beside the chaos altar. You could also ask the tramp again he will tell you.
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you need a partner to do that quest and i recommend using runehq.com its my first choice if you need quest help or even skill help.
When you start the quest Shield of Arrav, talk to the Phoenix gang leader. who is the Phoenix gang leaderYou need yourself and a friend one that's a member of one side and the other.
In front of the door of the Varrock rune shop.
The weapon store key, I think, is part of the Shield of Arrav quest. To get the key, you must talk to the leader of the Phoenix Gang to get your job. You will have to kill a level 3 person named Johnny the Beard in the bar. He will drop documents and you need to pick them up and give them to the gang leader. He will then give you the key to use.
Once you joined a gang, you can't quit it. So before joining, choose whether you want to join Black Arm, or Phoenix. The above is wrong. If you know the spell telegrab and you are on the Phoenix Gang you can use the spell to steel the 2 cross bows and give it to the Black Arms Gang. Then you can join the Black Arms Gang.