Thx for the comments guys. I have to add only the top rifle is mine, the bottom one is my teammates rifle.
@ Massumma:
Indeed, he had the standard Maruzen CA870. Also that shotgun had a pin where the rear grip was attached. You have to saw the pin off. So once you do that, you can't convert the Masterkey to a regular CA870 anymore (unless you do a custom job offcourse).
@ masakarijoe:
Idd, a black wooden grip would be better, maybe he'll spray it someday.
@ PvtRyan:
I agree with the crane stock, but irl they did also used the Masterkey in combo with RIS, didn't th