Also, if you read over the link I posted, it gives the serial number range of the pistols.
SERVICE MODEL 9MM PISTOLS
Introduced on January 11, 1984 was the first Service Model A112 in 9mm Parabellum. Essentially, this was the same gun as the A111, except for caliber. In fact, the slides for the A112 pistols were made from the same 17-4 stainless steel investment casting, as were the slides for the A111 in .45 ACP. This model remained in the line until July 23, 1984. In all, 301 of these 9mm pistols were produced in a serial number range of RF04666C through RF07599C.
Although there were relatively few Randall A112 pistols ever made, a change in production early on resulted in what was essentially two separate sub-models. The first Model A112 pistols employed Stainless steel, six-groove standard Colt-type barrels and barrel bushings. The outside diameter at the muzzle of those barrels was 0.495-inch.
By 1984, it became apparent that the company could facilitate production by using a fatter barrel, which would allow the standardization of barrel bushings. These later production Model A112 pistols featured barrels that had the same outside diameter as the standard .45 ACP. And, there was more of a change than simply the outside diameter of the barrel in these latter-day Model A112 handguns. Randall at that time went from six-groove rifling to its hallmark 10-groove configuration in theses 9mm Fat Barrel units. The rifling was changed to enhance accuracy, and it also made the number of grooves standard throughout the Randall line since the .45s always did have 10-groove barrels.
Production of the Combat Model A122 began on July 23, 1984, and ended December 13, 1984. It was essentially nothing more than the Model A121 (.45 ACP) in 9mm. This meant that it differed from the Model A112 9mm in that it had a slide with a flat top and fixed rear sight, a round hammer and Pachmayr grips. Only 18 Model A122 pistols were ever made, making it the rarest of the right-handed, full size service pistols Randall ever produced. Of the total production of 9mm Randall's, nearly 75% were exported to the European countries of England, Germany, Austria, Switzerland, and France. Only 35% of those 9mm Randall's had the fat barrels. Of Randall's total production of full-size, right-handed service models; the 9mm pistols represented a scant 3.2 percent.
"COMMANDER"-SIZE 9MM PISTOLS
The Model A212 was introduced on February 1, 1984. Like its .45ACP counterparts, it also went through a name change in 1984, becoming another in the "Raider" family. Primarily, the biggest difference between the A212 and the A211 (.45 ACP) was the caliber. However, the A212 also was made in two different barrel widths -- the latter are rarer being the Fat Barrel guns. In all, there were only 76 of the A212 pistols manufactured, or which a mere 25 had fat barrels. The serial number range was RF02359C through RF03815C. The last A212 was manufactured on December 13, 1984.
Randall Model A232 came on-line on October 11, 1984, and differed from the A212 in that it had a flat top slide with the Millett Model 100 adjustable rear sight. In all, only five Model A232 pistols were ever produced, and it is believed that they all were exported to Europe since none have surfaced since in the United States. The serial number range was from RF02473C through RF03777C. The last of this model was made on November 12, 1984.