Yes. The Remington 209 Primer conversion kit will work on any caliber Remington Model 700 Muzzleloader (produced 1996-2004).
The Model 700 ML conversion kit contains the firing pin assembly, musket cap nipple, the 209 primer nipple, 209 de-priming tool, and the bolt disassembly tool. The nipple will also be available separately.
These kits were all sold as accessories, and with the discontinuation of the Model 700 ML, they may become more difficult to find. We no longer house these parts and would encourage you to check with local gunsmiths in your area to see if you can get them.