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Gunsmithing Bolt ejector roll pin

I would caution you to not assume anything. This is one particular area where literally everyone (manufacturers) are on their own page. Some use a roll pin and others use a solid. That can also change within a given series from a manufacturer.

The safe money here has 2 options:

Call the manufacturer and get the size or
Pin gauge the hole to determine its size, then source the right pin. Keep in mind the pin needs to have a slip/interference fit so it doesn't fall out.

McMaster Carr has a great selection but your going to be buying a bag full of em. Thankfully this stuff is pretty cheap.

Good luck.