My first ML rifle was a H&A underhammer, the Heritage model in .45. It accounted for many a snowshoe rabbit!
Numrich made several versions. The regular had the long barrel and open sights.
The Heritage was the same but also had a brass piece behind the trigger guard/main spring which helped to increase the spring tension. It also had the neatest peep sight, a lollipop on the tang which was adjustable for windage by loosening the aperture and sliding it left or right, for windage by turning it to screw it up or down, and the neatest feature was that it had a piece of spring steel with three aperture holes, large, medium and small. you could rotate the hole you wanted into place and it indexed into a small notch to hold it in place. It also came with an open rear and target front sight.
The Buggy Rifle was the regular piece but with a short barrel, to be carried conveniently in a sheath beside a buggy seat.
I still have a tattoo on my left forearm from powder coming out the nipple. I learned real quick to wear a long sleeved shirt!
Sure wish I hadn't sold it....
Maybe Hanshi will be so kind as to post photos of his.
~Kees~