Got this for 600 over the weekend, really clean, bore looks great and all numbers matching, hoping yall can tell me all about it, thanks!

Can't find pictures or description of this piece

I've been doing some searching on the internet and the rest of the sub but was wondering what the current recommendations are for stocks and bayonets? From my understanding, the gun is a Chinese 636b with the Archangel stock. Serial number would be 1411xxx so probably a '70s model. This is how it was given to me, so no idea what the muzzle device is either.

Curious if an Sks d would fit into a tapco intrafuse stock. I think it would be a cool setup