Hey Flyfish.
My K22 is a M17-4 made in 80, (78-Kxxxx) I think??? That's around the time I bought it.
So what revisions made it a -4?
And can this be classified as a combat masterpiece? Adjustable rear sights, fat trigger, and oversized grips.... The hammer is the transfer bar type.
Any info you can tell me is much appreciated.