Just a thought...

[Atmosphere]

Why not produce M1 carbines in .357 .44 and .50 ae? I mean the .30 carbine is only slightly longer than these rounds so a carbine in these calibers is not far fetched. And these calibers would add increased firepower in a semi auto package to rival the lever guns in some of these calibers. Also isn't the rim of the .44 and .50ae the same which would lend itself to using the same bolt? I know that desert eagle can utilize all three rounds with the change of a barrel if I recall correctly. Plus add a black synthetic stock and a railed upper hand guard like the one fulton offers and now you have a black tacticool rifle that is california legal and uses these common loads. Would such an idea fly or would it be a moot point? Feel free to pitch this idea to Auto Ordinance, Fulton, or whomever I don't care to take credit. Just hoping to maybe inspire someone to produce such a beast and widen the choice range.

[VegasND]

Long ago, when M1 carbines were plentiful and cheap, there was a company that converted them to .44 mag pump rifles. But, nobody makes/has available cheap carbines any more. If someone were to tool up to make these anew, prices would all too likely be prohibitive.

However, should you find investors, put me down for one...

I'm still waiting for a Hi-Point carbine in .45 ACP

[ar15barrels]

There was another company converting them into 45 winmags.
The 45 winmag will single-stack in a regular carbine mag.

I think the main reason you don't see the rimmed cartridges mentioned above is because they won't feed from regular M1 carbine mags.
If they won't feed, people won't buy the conversions...

Look at how the rimmed rounds stack in an SMLE mag.

[Atmosphere]

Well looks like .50ae would be the choice since it has a rebated rim and would solve the stacking issue (which begs the question, how does .357 and .44 stack in the DE mag?). Although I dont know if the original M1 carbine mag is double stacked and can handle the width of the 50. I guess this concept would be a pipe dream at best unless there is an alternative caliber that could be easily accommodated to run in the carbine. What about lengthen 10mm?

[ar15barrels]

how does .357 and .44 stack in the DE mag

At an angle, just like an SMLE.
Carbines feed with the top round sitting straight.
Desert Eagles feed with the top round pointing slightly upwards.