If it's not designed for it, DON'T Do it.
the S.A.S knew to put that in an AC130.
Colt 1911
45 ACP can be used in both auto and revolver. The revolver must have a 45 ACP cylinder.
just the sheer size of the .22 caliber pellet will do more damage than a .177 pellet. Here are the sizes of pellets today that are on the market. .177, .20, .22, .25, 9mm, 45 cal and 50 cal. The last 3 are usually restricted to PCP air rifles. (Big Bore)
Colt 1911 .45 cal
100 or so
In good condition it is worth between $45-$85. More if it is in excellent condition.
If you are referring to the present, today's most powerful sub-machine gun is the H&K UMP .45 cal sub-machine gun, or the Kriss Vector SMG. if you are referring to the past however then its undeniably the Tommy Gun. also a .45 cal sub-machine gun.
Air Rifles come in several different bores. .177, .20, .22, .25, 9mm, 45 Cal, 357, and 50 Cal. Big bore usually refers to the 9mm, 45 Cal and 50 Cal. These rifles fall into the PCP class of Air Rifles.
Gun shop, gun show, on-line firearms auction.
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Check all the 1974 gun publications you can