You have an interesting variant, that drum looks like a replica or is fact a period drum larger than later drums. The MGC drum was exported to Auto Ordnance because they are a bag of dicks.
I have numerous examples of the smaller one. The large 1921 drums are extremely expensive, and I was simply going t print one if I needed one.
When you flip it over are there any date marks near where the screw goes, I think?
My best mate Joe was made in 1979, and has character, so don't dispair. If you don't like it I'll buy it.
Meaning, I've seen an issue in the modelgun hobby, it's take or leave it, which is certainly not a way to run a hobby. My delay to market is that I have a wide range. So even if a buy guesses which one the might like, they know it was a guess from a selection
There's a psychological issue. Alan Watts points out many times that without some contrasting view, you cannot get a good look at anything.
That's my motivation here, if that's a big drum an orginal is "lots". That might speak to getting a rational sized drum, keeping in mind that one has character.
I like Joe, but I have an Armory full of that gun. Joe's butt plate is bent away, I was checking Joe for the usual rust spot on the buttplate. Joe's buttpplate was replaced, in Japan. The Japanese MGCs are usually treated as art, and come here intact. Joes Cutts is missing, leaving a stub for a front sight. Joe has seen some things. Made in 9-79, the wear is appropriate for it's age. Likewise yours if that old, of course has no innards, as it's seen stuff too. Also, don't think getting "innards" is hard. I have an entire engineering library. What's hard is getting people to work when for some reason a prerequisite is them reading my mind. I got into Japan first, but I'm not going to be a UK style outfit, I'm American, and we do guns, and we did Thompson. That said, Auto Ordance appears to be in the business or selling trademarked logos to Chinese airsoft companies, not serving a cultural population in the US.
Meaning, it won't be hard to dunk on Auto Ordnance parts wise, it ain't that hard.
People might not correlate computer systems with an Armory. My computers must be as efficient as I am, so with Windows, that took Python, and I don't know Python. I've got Python running interference so I don't have to hear about internal matters that are solely the business of an instuction pipeline based system.
Likewise I learned Japanese culture, and efficency demanded I likewise not concern myself with internal Japanese matters. Doing that let me in the door and the Japanese just kidnaped me. Meaning I didn't know I was in their culture, until they made it known they spotted me the moment I arrived. It's just efficency that brought guns to me.
And likewise a lack of efficency makes it look like a parts set designed basically in the style of the 19th Century manufactuing era, is not hard to make. It's just impossible to jump start your innards via inefficent American culture, it's embarassing.
We ran some tests on 9mm PAK. Logically for western guns that are disabled, a new 9mm PAK kit makes way more sense than focusing on a mechinism that departs from the orignal reliability.
If people started looking at the "inards" as needing a western style kit, then it's very cheap ammo, and the gun operates as designed.
Oh, Pro-Tip You just align the 9mm Pak magazine in the USGI Thompson magazine. The 9mm PAK are single stack, and we stuck with that for reliability reasons. For hobbyiest, anyone can buy a doubstack for Cheaperr Than Dirt, and go to town, and have something that works to show off.
Since I have an Armory to run I have to be careful so as not get sucked into a hobbyist activity, like mini mils mini lathes, 3d printing, double stack. I optimized 3d to fit my efficiency, but it was out of mind until I needed a part, then POOF, a one print development cycle. I needed an in Armory stock slide, they are $80 in steel. I managed a two-fer, the same part works in armory, but I got a good fail dynamic making it suitable for public sale. I'm not on a tangent, I'm saying if I can POOF a Thompson part from my brain, people should probably not conclude parts are hard for people who know Scientific Method. The collective consequence of trying to read the actions of professionals is if I don't have the parts for you already, there's a reason, and hard aint it.
Last thing, I'm using Python to cast a wide net to all "adjacent to WW2 forums". One might think the most efficient path for me is to sell here. Well, I'm an American who knows American culture. I'm not avoiding MP40 forums at all. If I don't cast the net when I see white men, in their 50s are not servied as they demand quality indicators. They have the funds, which is my responsbilty to collect so the huge upfornt of opening Japan the absolutely stupiest way possible, lets me move forward more knowledgeable of world wide culture. Meaning I did scientifically supported models, and selling to a small market lkely ends the Armory. Leading everyone to think Thompsons are "hard". I was the very last, most incompetent person to have had to deal with the Japanese. Gun culture Thompson nuts drained capital, not MP40 guys. It's a tough fight if you have to it alone.
Believe me, I hear your guns got no innards, I just thought I'd say, I take a knee when I cannot model out ahead. That means I still have a shot by not using the UK model. I'm on the forum because I'm read to. If I'm not in the community, what motivation do I have to use care, and see about some parts.
Good, luck hope to hear more, I have to start a rampage to get to market. A rampage is only a little harder than UK speed. Now I'm just being redicoulus, but I want set the tone, that if ain't fun, you should probably not be in the business you're in. Chow Baby!