Mine has worked fine given two caveats:
- It needs to be well lubed. A problem with rimfire AR conversions is that they have nothing to prevent them from firing out of battery, and so if the bolt is dry and doesn't quite close all the way, things could get exciting for people to the right of your rifle.
- Remington Golden Bullets have had me prying duds out of the chamber three or more times per magazine. Have I mentioned how much I hate this carton of ammo? But it's plated, and I vastly prefer plated ammo, since it'll probably not foul the gas port as much.