Part ID help.

[Predator1]

Took my 14 classic out of the case this am and this piece was spun around and about to fall off. I took it and tried to see what was wrong and I’m actually not sure. I see how it goes back on by the detent riding in the groove in the bolt. I can see there is two balls in the hole but there’s not really a positive lock up when the detent goes in the groove. Should there be a spring or another ball I’m missing and what is this part called?https://preview.ibb.co/bZ7Gvn/341_C5404_9791_479_B_9609_E83_E4_B884_B45.jpg (https://ibb.co/b3FQo7)

[RustyShackle]

Commonly known as rear baffle.

Edit: finding one in gloss might prove to be a challenge

Edit edit: you might try applying some lubrication and rotating it a few times in and out of the groove. Possibly just some buildup of crud causing your woes.

[Predator1]

No way to fix the detent balls or spring?

[RP12]

2 ball bearings and a spring.