I have an old Stanley, not sure of the model. It's the kind with a handle on either side, and the 'blade' is a hexagonal shaft with an edged foot that is adjustable up or down with a set screw. Also you can attach a short fence to it. I used it for many years to rough out barrel channels by using the 'Herschel' method i.e. cutting the upper portion of the blank initially to match the profile of the taper flare, and cutting the sides to match the profile of the taper/flare, and then chiseling out an initial groove before going at it with the plane. It worked well for getting "close" but there was a lot of final fitting involved, and you definitely need to use the shortest fence possible. I had a fence that came with it and I cut it down a little to better follow the side profile as I wasn;t doing straight barrels, where a longer fence would be just fine. A fence is crucial as the edged foot is tapered and with no fence, one will tend to wobble or angle it side to side as it;s being drawn along, and the edges will dig into the side walls of the channel with no guide which creates a messy inlet.
Now I think it's a lot easier to just throw some $$$ to Dave Keck.