I had a Handi Rifle in 30-30 and additional 20 ga to which I adapted a 45-70 barrel. The gun was accurate and fun to carry. I added a scope with the hammer spur so that the hammer could be thumbed easily with the scope. Using black powder and cast 385 grains it was capable of under 7/8 inch for 5 at 100.
I did have problems with the gun after years of use including hundreds of very hot 30-30 loads, well over max and showing pressure signs , the firing pin developed a 'mushroom " effect and I began experiencing hang fires. Replacing the firing pin is a complicated job and when the problem came back the gun went as trade bait.
These guns are very easy to re stock as the inletting is a ball and socket like fit. I made a beautiful stock from a piece of 2 inch thick nicely figured walnut, added a brass fitting where the forestock and reciever join as well as a brass butt plate. The problem with a shotgun and scoped rifle is easier to fix by having different dimensioned stocks than any other method I can think of. Switching only involved a through the butt stock bolt.
The gun accounted for mulies, whitetails, huns and sharpies.
Despite the firing pin troubles which are at least partly my doing I would like to have another.....maybe a full length forestock, walnut butt, schoetzen style complete with those wild looking hooked butt plates, brass trigger guard etc .