No such Model in the Colt line.
the colt mark 4 is a 1911 model pistol acp (automatic colt pistol ). 80 series was made during the 1980's but was not made in 40cal. from the colt factory, only in 45acp and 38 super.
Different designations simply mean different things. ACP stands for Automatic Colt Pistol, meaning it was originally designed for Colt Auto Pistols, however, pistols from various manufacturers will fire ACP ammo. Other designations, such as SW in .40 SW means the cartridge was designed by Smith and Wesson. WCF stands for Winchester Center Fire. GAP stand for Glock Auto Pistol. There are various others.
There isn't a .40 ACP - the cartridge you're thinking is the .40 S&W. Basically, it's a larger cartridge than the 9mm, being essentially a shortened version of the 10mm auto cartridge.
No such Colt model
40 cal ACP (not CAP) is the same as 40 cal. S&W. ACP refers to 'automatice cartridge pistol' wheras S&W refers to Smith and Wesson, who also make the 40 cal. cartridge....
45 colt
my opinion is the 45 ACP round has more knock down powder then the 40 caliber
Colt data is at Proofhouse.com
44 Colt not produced since 1940. Less than half the energy of the 44-40 44-40 still in production.
Most U.S. police officers carry semi-automatic sidearms in 9mm, .40 caliber, or .45 ACP. Glock has about 65% of the U.S. law enforcement market. Other major manufacturers are Smith and Wesson, Sig Sauer, and Ruger.
.40 S&W cartridge, bullet diameter = .401" .380 ACP cartridge, bullet diameter = .355-.356" .32 ACP cartridge, bullet diameter = .311 - .312"
When referring to the .40 caliber cartridge, SW always stands for Smith and Wesson, regardless of the brand of the gun, because the .40 S&W cartridge was designed by Smith and Wesson. The offical name of the cartridge is .40 S&W, just like the official name of the .45 is .45 ACP (Automatic Colt Pistol). People have a habit of leaving off things they don't think are important, so the .40 S&W is commonly called just "40."