Natchez has Remington UMC 55gr. FMJ in stock for $ 5.89 per box, $ 294.50 per 1,000.
Not the $ 179 we used to pay for 1,000 rds. of XM193 delivered, but if you need some ammo, at least they have it in stock.
There is a 100 box limit.
And yes I know reloading is cheaper and it isn't 5.56 and its not loaded to NATO, etc. but it is rated #6 on the ammo list at AR15.