I'll be damned.
I had never read the original Rollin White patent! I knew he had developed the through-bore cylinder, how S&W used it first and then the SAA or something like it from Colt was inevitable once the patent ran out in 1872 (actually they did open-top factory conversions to centerfire first, in 1872 while developing the SAA).
Now, reading the patent, the bit about "closing the magazine to protect the cartridges" suggests he was using
paper cartridges at first. That would explain why he didn't need an ejection cycle like Maurice has! But what the hell did he use as a primer and firing pin? Primer powder at the rear of a paper cartridge, and a long-arse firing pin? That...couldn't have been very reliable, could it?
I still think Maurice is more similar to the Mauser MG 213 which used a mechanical shell rammer and mechanical stripped (both gas operated) and stripped rounds from the top of a conventional magazine or belt feed setup:
Maurice's gas-operated ejection cycle operates independently of the magazine and in fact I started with the gas ejection cycle as a necessary prelude to mag feeding. The first test of a brass-based gas trap worked great in .38spl but blew about 12ft downrange the first time I shot 357 through it
. Upgraded to steel to solve that problem, but of course scrapped all that once I converted the gun to 9mmPara so the shells could slip past the gun's guts (mainly the pawl, which is still slightly clearanced!) since the .357 shell was too fat. I considered custom-narrowing some .357 shells so they would barely headspace but discarded that idea without trying it as just too wrong
. I wanted standard ammo to run. Mag feeding let me ditch the original ejector rod and housing completely and run the gas line much cleaner to the original ejector rod position in the frame.
9mmPara had the benefit as well of being shorter so I could fit more in the mags.