That is NOT a MKIII. That is a Colt 357, an earlier gun that was built on the same frame as the Python (except for the little area where the ribbed barrel meets the frame on the Python). The 357 and the first-generation Trooper were basically the same gun with two different names, except of course that "357s" weren't built in .22LR.revhigh":1lve691r said:
Here's my .22 Trooper (first generation) and Python. You can see the trigger guard shape is the same.