Thompson Contender.
-Trolling via S3.-
From WIKI
A number of handguns have been chambered for .30 Carbine ammunition. In 1944, Smith & Wesson developed a hand-ejector revolver to fire .30 Carbine. It went through 1,232 rounds without incident. From a four-inch (102 mm) barrel, it launched the standard GI ball projectile at 1,277 ft/s (389 m/s), producing a large average group of 4.18 inches (106 mm) at 25 yards (23 m); the military decided not to adopt the revolver. The loud blast is the most oft-mentioned characteristic of the .30 M1 Carbine cartridge fired in a handgun.[7]
In 1958, the short-lived J. Kimball Arms Co. produced a .30 Carbine caliber pistol that closely resembled a slightly scaled-up High Standard Field King .22 target pistol. The Ruger Blackhawk revolver chambered for the .30 Carbine round has been in the catalogs since the late 1960s. Standard government-issue rounds clock over 1,500 feet per second (460 m/s), with factory loads and handloads producing similar velocities.
Universal Firearms made a .30 caliber pistol from 1964 to 1983, it was named the Enforcer. Built similar to the M1 carbine it lacked the stock, therefore, making it a pistol or a handgun. Sold to Iver-Johnson in 1983 The Enforcer continued to be made until 1986. Other handguns chambered for this cartridge include the Thompson Center Contender, Taurus Raging Thirty, and AMT/IMI AutoMag III. Of the .30 carbine pistols available today I believe the Ruger New Model Blackhawk listings in Ruger’s catalog, the .30 Carbine is still there: Model No. BN31, 7 1/2-inch barrel, blue finish is the only pistol (revolver currently being made/sold today.
You can still get the AMT/IAI Automag III in 30 carbine on the used gun sites (gunbroker) for around $600 to $1200. IAI and AMT were owned by the same person, "Harry Sanford the designer and manufacture of the pistol ( among other pistols". He spilt up his operations because of the big lawsuits going around at that time and wanted to make sure if one came his way they couldn't take the "whole" pie. So not to confuse this, AMT was first, then he split it into AMT and IAI, then once lawsuits settled out he dropped the IAI operation name and went only under the AMT name then.
IAI was the first company name to be stamped on the Automag III 30Carbine, later they added the 9mmWinMag caliber to the Automag III. They are different specs to many of the parts between these pistols.