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The Marlin Camp Carbine is a simple blowback gun, made in 9mm Luger, using Smith & Wesson Model 59 pistol magazines (thus also 5906 magazines), and .45 Auto, using regular 1911 magazines. For some people, a long gun which uses the same ammo (and magazines) as their handgun is a big selling point, and that's what these guns offer.
This one is pictured with a Taylor drum, which fits aesthetically, I think.
The Camp Carbine has a bit of a quirk thanks to its design (probably a combination of the amount of space the bolt has to travel, its weight, as well as how the action beds into the stock), where the bolt bottoming out, hitting the rear of the receiver, will gradually batter the wooden stuck until it cracks and then slowly splits.
Obviously, this would not be an appreciated gun if it did this, and part of its design is a buffer pad made out of neoprene which sits at the rear of the receiver to absorb the impact, thus saving the stock. Not the most elegant solution, but it works. Neoprene does however eventually dry out and desiccate, and once it's old and hard enough it will stop absorbing those impacts and the bolt will instead pulverize it, then after that it will begin to hammer the stock.
This used to be a problem with these things, because after 10-20 years those buffers will have given up, and there was no source of replacement ones out there for a long time (and examples with broken stocks from use by people who didn't know aren't rare), but these days you can get new ones easily, order a whole bunch of them online for a couple of dollars and you're set.
One of the workarounds to a broken stock was to get a plastic one, as apparently they tolerate it (potentially they have enough flex in their plastic material to act as their own buffer). Choate makes a folding stock-set out of plastic which seems to hold up, looks a little ugly but it's functional. There's also a Muzzelite bullpup kit for these, and I would expect them to be as rough and flimsy as typical.
