I thought states with the #11/Musket cap requirement also required a open breach too. Even if you could convert a LRH, the cap would be enclosed. I thought Original DISCs had an insert for the Orange FPJ to use a cap. Mine mentioned it in the manual and had something in the parts bag but i never looked at it. I know where to get one NIB for $199 in 50cal blue.

Ive never seen a red DISC cap conversion but i guess it could be done. Finding a MK85 in good shape is probably a better way to go and much easier to carry than a LRH.