Interesting you wrote this I was just looking on GB and saw a single action only and was wondering if it's convertible to both single and double and was going to ask here on the forum if anyone knew anything about it ?
Yes, I know about it.
My first one was a regular, everyday K-38 converted via the SAO conversion kit waaaaaaaaaaaaaay back when---when the name of the gun was SHORT ACTION SINGLE ACTION K-38. The advantage of the gun is the SHORT ACTION (shorter by something in the low 20+ something percent)----and it's an advantage to those who've been through the military sniper training----and know how to and practice shooting between their heart beats!! I reckon it's also an advantage in that you don't have to move the hammer as far when you cock it for single action----and therefore you can do it faster for timed and rapid fire work. Don't ask me how much faster, because I don't know---I and if I did know, you'd laugh out loud!!
Mere mortals like the rest of us react by saying HUH?!!
My second one came along in 1998, not because I'd learned how to shoot between heart beats, but because I needed one to fill a hole in my collection of S&W target guns---and I wasn't going to shoot it at all.
As to whether or not you can convert it back to double action, absolutely. I know for sure and certain you'll need the regular double action hammer---and the double action sear---and pretty sure the double action trigger (memory's a little fuzzy on that).
Ralph Tremaine
Actually---I do know how much faster you can cock the hammer------like I said, "something in the low 20+ something percent"-----same as the reduction in hammer fall distance---thereabouts-----on a good day! ("Short Action" is another name for "short (or reduced) lock time"---assuming I'm remembering my lingo correctly.
To put all this in perspective, we have the pre-war long actions, the post-war short actions, and the shorter yet action of the SAO K-38. If you want to see this with your own eyes---this being the difference between regular post war short action and the SAO short action, get your hands on a machinist's ruler (which is what I used 'cause I'm picky---and because it'll fit between the bottom of the sight and the bottom of the notch), and measure the distance from the tip of the (cocked) firing pin to the vertical surface of the notch cut in the frame underneath the rear sight. (There's no need to spend your time doing this to compare the distance to a pre-war gun because the dimensions of the notch in the frame underneath the rear sight are different.) Besides that, you can see the difference in hammer fall distance between pre-war long and post-war short without measuring anything---even without your glasses!!