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An example of the Marlin Camp Carbine in 9mm Luger, this one has a scope fitted, and some of the Smith & Wesson pistol magazines to go with it, including two extended ones, even longer 30rd ones exist as well. I have once seen a Smith & Wesson 5906 pistol magazine which has been welded onto a Finnish Kp/31 subgun drum, giving a capacity of above 70rds (not sure if the added 'tower' increases capacity).
I'd be a bit wary of the plastic magazine well and how well it tolerates the weight of that steel drum and all the bullets, but I presume that using the drum for a range toy would be fine.
The .45 Auto chambered ones were fancied for a while as some saw them as appealing suppressor hosts, the cartridge being subsonic in normal loadings. I have seen a custom one with a large integrated suppressor fitting in an inletted stock.