During the Summer, I completed two projects, Spencer related. The first was a "sighting-In" table for my Spencers, but will also work for my flintlock rifles.
Two 3/4" pieces of finish plywood cut to my shape and preference, and folding legs and lots of poly and this is the result. I wanted an adjustable stool and found a beat up old piano stool at a second hand furniture store, cleaned and sanded it and poly'd the heck out of it.
The second project was a "Shooting Vice" built primarily to test fire my Spencer Shotguns. But, as you can see, it also fits my old original Spencer Carbines, too. I just lay it on the ground, tighten the bungee sords, tie a string to the trigger walk to a safe distance, and pull the string. The weight of the vise made from 2 X 6 boards, as you can see, keeps it from moving. I cut holes to fit the barrel through.
Love this stuff . . .