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You could get those rifles for like $700 each. So like 2 grand for three. The reported 375 rounds of .223 ammo would be $150 or so.

The truck could be leased or financed. Very possible for a diligent saver.

Please do inform me where those rifles could be had for $700:

Palmetto state armory. Decent quality from what I've heard.

You can even buy the uppers and lowers separately and assemble them yourself for even cheaper.

Smith and Wesson M&P Sport goes for a bit more.

Note: not a firearm owner, so maybe there's additional costs involved that I'm not aware of.

Truck belonged to his grandmother.

Possible he used her credit card(s) to purchase the firearms.