KFC also produced multiple hunting shotguns variations that used the Murata style bolt actions with the more original Tanegashima style stocks. Can included a translated blurb I got from a fellow collector friend, the focus is more on the Murata's themselves but include some insight to the KFC made guns as well. I sadly do not have the source on me from where he got it.
"Here is a blurb on the Muratas converted to shotguns. From a Japanese source so English is not perfect. Need to do a little research on dates of restricting ownership of certain weapons.
The 13-year and 18-year Murata rifles, which were retired from the Japanese military, were converted into shotguns and released to civilians under the pretense of hunting shotguns. In addition to the Type 13/Type 18 shotguns using 28, 30, and 36 gauge ammunition produced based on the existing 11×60mmR ammunition, numerous gun companies and workshops, including KFC (Kawaguchiya Firearms Company), produced 8 rifles modeled after Murata.
Murata-type shotguns were made in a wide range of calibers, from large-gauge pellets to small-gauge 7.6mm pellets. Additionally, shotguns were made by transplanting the barrel and operating parts of the Murata shotgun into the body of the Tanegashima . These Murata shotguns (both modified Type 13/18 and newly produced Murata-type shotguns) can use only black powder brass cartridges in common, so the misfire rate is high. The disadvantage of shotgun ammunition with plastic casings widely used in modern times is that they cannot be used unless they are separately modified. Shell casings and handloading tools for the Murata shotgun were produced until the 1990s. If you look at the anecdotes of hunters who were active in Joseon during the Japanese colonial period, there are many records that rich hunters buy American Winchesters or European firearms, and poor hunters use Murata rifles. In addition, many hunters in Japan also used these shotguns, and in particular, in Japanese films about the hunters of the Tohoku region, Matagi, they appear as almost essential elements along with the Tanegashima rifle. At the end of World War II, the Japanese military conscripted even the Murata shotgun that was released to the civilian population and put it into the mainland defense force. These are the variety of calibers/gauges the shotguns were produced in: 8-gauge, 10-gauge, 12-gauge, 16-gauge, 20-gauge, 24-gauge, 28-gauge, 30-gauge, 36-gauge, 40-gauge, and 7.6mm pellets. "