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A couple of questions. What 30 cal. round does the carbine fire if not the 06? How many rounds do you think you need in an urban setting? You aren't humping gear on a LERPS patrol and support can be on scene pretty quick.
My choice for knock down power is the .308 but considering an urban setting I would take the 7.62X39 to protect nearby citizens. Real close I prefer OO buck or deer slugs.

A couple of questions. What 30 cal. round does the carbine fire if not the 06? How many rounds do you think you need in an urban setting? You aren't humping gear on a LERPS patrol and support can be on scene pretty quick. My choice for knock down power is the .308 but considering an urban setting I would take the 7.62X39 to protect nearby citizens. Real close I prefer OO buck or deer slugs.

The original request for a compact and lightweight shoulder arm to replace service handguns for second-line (non-fighting) troops was first issued by US Army in 1938. The idea behind this request was that a shoulder arm, such as carbine, firing ammunition of moderate power, will have more effective range and will be much simpler to train the users to fire it accurately, than the standard .45 caliber semi-automatic pistol or revolver. This request was probably the first recognition of the need in the Personal Defense Weapon in the modern sense. Request was shelved for some time and re-issued in 1940. It included the new cartridge of .30 caliber but of power far less than of US general issue .30-06 ammunition. The cartridge, officially named the "cartridge, ball, .30 caliber, M1", was developed by the Winchester company. It was a straight-case, rimless design with round-nose bullet weighting 110 grains (7.1 gram) and muzzle velocity of 1860 fps (~ 570 m/s). Muzzle energy was about 2 times more than of .45ACP pistol cartridge but still almost 3 times less than of .30-06 rifle cartridge. In the modern sense the .30 carbine cartridge can be called an "intermediate" but the lack of the muzzle energy and round nosed bullet limited the effective range to about 200 meters or so. Anyway, it had still much longer range than any pistol round of its time, along with moderate recoil.
http://world.guns.ru/rifle/rfl08-e.htm

***What 30 cal. round does the carbine fire if not the 06?***

psst, the .30 Cal Carbine is a caliber.

What 30 cal. round does the carbine fire if not the 06?

The M1 .30 Carbine is a straight walled cartridge (not a bottle-neck cartridge).

Factory loads offer a 110 grain ball.

I don't recall what the FPS of factory loads is, but my Hornady manual shows a 110 gr. bullet @ 2100 fps (muzzle velocity) when loaded with 14.9 grains of H110.