Seems pretty sketchy. Prices are all out of whack. 6.5 Grendel America gunner 500@ $500, but Hornady black 6.5 Grendel 500 @ $350.
Looks like their pricing gun can only do $500 and $299 through $390.
When I've bought rifle ammo by the case its most often come in 10 each 20rd boxes for 200rds per case, not 500.
Also seems odd that the primers are 10x normal retail and the ammo is for the most part 1/2 of normal retail. Except for the Russia metal cased 7.62 stuff that's 1.5x normal retail.
If the email and payment options aren’t enough to clue you into it the fact that when I tried to purchase the 1500 dollar Colt 45 it didn’t ask for any FFL information should do it for you.