My Inland has a Big Brother (sort of).

[Bubba-7]

There was a lot of experimentation done in 1945 with the M1 carbine. There are Inland barrels in 22 caliber.

[imarangemaster]

There was the 22 Gustovsen (sp?), which was a necked down 30 carbine, IIRC, but it lacked case capacity. Then cam the .224 Winchester. It had the same case as the current 223, but a shorter, stubby 52 grain bullet. It was designed for the Winchester Light Military Rifle. Armalite used the .222 Remington special (longer than the 222 Remington) that was renamed .223 to prevent confusing the two rounds.

[browningautorifle]

Is this the cartridge we seek?

[floydthecat]

I think the 5.7 x 28 might be a good round for the carbine. Pressure is not too excessive at around 50,000psi and cartridge OAL is not too long to fit the action. One would have to secure a 22 barrel and chamber it, but it looks do able to me. 5.7 x 28 appears to be the cartridge of the future.