Well it wasn’t body armor he was wearing -— but yes you can save up for guns —and vehicle working at Wendy’s when you have no other expenses. Remember he wasn’t attending school. So he worked likely all week.
Daniels Defense is a 1400 dollar rifle. The other generic one was no less than 800. The truck looked rather new. Call it 9000.
You cannot work more than 29 hours without being called fulltime, due to Obamacare regulations (this one has not been overturned.)
Call the wage at Wendys 12 an hour. That’s 311 a week take home, in Texas.
9000+1400+800=11200 / 311 = 36 weeks. He’d have to have started Wendys at 16 1/2 years and spent absolutely no money on ANYTHING else. No snack foods. No video games. Nothing.
All of this is very unlikely.