Lube the snot out of it!
When an AR doesn't want to feed, when it previously did, squirt some lube into the holes on the side of the bolt carrier, work it back and forth a few times, then more lube. It's a new bolt, and carrier, most gas rings have some roughness on the outside diameter from the stamping process.
For some reason, I prefer to charge with the bolt down, and then work the charge handle to strip the first round. Just something to try.