I asked a question a regulators on here yesterday but got things a bit wrong.

The regulator I found on sale fits a BSA Gold Star, not a Scorpion as I stated. Ad says this:

For sale is an original BSA Gold Star regulator, it was removed from a fully working rifle during a conversion and works exactly as it should. This can be fitted straight on and will work as intended. It was removed from a .177 which uses a slightly higher pressure setting than the .22. It will also fit onto the Ultra and scorpion actions as BSA use the same firing valve and tube threads in all of their tube fed actions.

Is this correct? Will it fit my non MMC Ultra?

Thanks