If he dealt drugs it wouldn’t be difficult to come into that level of cash. Some deal because they can also get personal nose candy and the like free.
So now he's a drug dealer? I am always amazed some of my fellow Freepers can be so freaking out there. Do you have any evidence whatsoever that he was dealing drugs? That he even used illegal drugs? Didn't think so.
Do a little research and you will find that he could have purchased the weapons, ammo, body armor, and accessories for $7500 tops and probably closer to $5000. He was not unemployed, but rather a grad student with a TA stipend. He was probably eligible for large student loans. According to several sources, his parents reside in an exclusive neighborhood in San Diego. And even a dog or dead person qualifies these days for a credit card with a five figure line of credit.