His arsenal:
An online retailer shipped 1,740 rounds of 5.56mm 75-grain boat tail hollow point to his doorstep, at a cost of $1,761.50. He ordered a Daniel Defense DDM4 V7 (an AR-15-style rifle) for shipment to a gun store in Uvalde, at a cost of $2,054.28. On May 17, 2022, he bought a Smith and Wesson M&P15 (also an AR-15-style rifle) at the same store in Uvalde, at a cost of $1,081.42. He returned the next day for 375 rounds of M193, a 5.56mm 55-grain round with a full metal jacket, which has a soft core surrounded by a harder metal. He returned again to pick up his other rifle when it arrived on May 20, 2022, and he had store staff install the holographic sight on it after the transfer was completed.
That's at least 5 grand total.
What 19 y/o part time fry cook doesn't have a credit card with at least a $5K limit?
I'm not saying it's totally impossible but I'd like to see more on how he bought his equipment, particularly since he was a known nut case.