Capt. Chris--

I suspect that the "Model 4-8" that is being referred to is the RKS limited edition with the upswept blade.

Viewers will see them on eBay on occasion.

If I recall, the sheath for my RKS is marked "4 8."

Others might know if RMK ever made the standard Model 4 in an 8-inch blade. I have not gone back through older catalogues to see if they did offer it in an 8-inch blade, although I suspect you and others have seen Model 8 blade styles in pretty large RMK knives. I suspect that the one or two that I have seen were made long ago as one-off's or special request knives.

Larry