What are you going to use it for?
I've always felt that if I could keep only one of my AKs it would be a 7.62x39 (rifles that is because the S12 is by far my favorite). Of course that calculation takes into account what other guns I own and how I use my guns.
One of the biggest things independent those factors would be whether you mind dealing with the corrosive ammo. If you are not the type to immediately and thoroughly clean your guns after each use you might want to avoid the 5.45.
He didn't ask for a financial adviser, IMO he can spend his money how ever he likes its really none of our business.
You're right our whole culture of making bad financial decisions didn't lead to people decisions having an effect on anyone but themselves right? Much of our financial woes right now have been brought about buy people buying things they couldn't afford, and a trend of increased debt and decreased savings. Since I'm on the subject I also want to point out how silly this line was
He paid into unemployment, it's his money,
No, No he did not. His employer did. The money comes from payroll taxes that are payed not by employees but by employers, so he paid nothing. Look up FUTA (Federal Unemployment Tax Act) and then get back to me okay.
Tax payers are eating an extra $70 Billion dollars to pay for extended unemployment benefits (I realize you said it is from a tax return check). Furthermore, whereas benefits have traditionally been taxable now we are not making people pay taxes on the first $2400 of it (thanks B.O.), further robbing tax payers.
Yes he didn't ask but sometimes it is appropriate, even charitable, to give unsolicited advice. I saw a guy try to load a 9x19 with 9x18. I politely explained that it probably wasn't a prudent move. He didn't ask anyone how to load his gun, I suppose I should have just stayed quiet. I imagine a big part of the reason he was trying to load those was he never asked, that part seems analogous here as well.
Rant off, carry on.