The gun shows no indication of having or ever having any kind of tape primer mechanism. I have seen those sheets of caps; they are not meant for feeding through any kind of Maynard priming mechanism, caps are cut out with scissors and placed on the nipple. (Saves using expensive copper for percussion caps!)
I would call the gun a percussion gun (shotgun, rifle, whatever). "Cap gun" would be accurate except that the term in American English means a child's toy gun using caps with small charges to make noise.
Jim
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