It would have the old style trigger bar spring for sure. I don't recall exactly how much different the bar itself is.
As I recall and my recall isn't what it used to be, Greg has some experience with just this situation.
I don't remember if it was a K or MK or one of the Tupperware models.
Course not everyone has Greg's MacGyver working skills.
I don't think the old parts are available if I remember correctly. A guy might get lucky at like gunpartsinc or one of those places.
In Memory of Paul "Dietrich" Stines.
Dad: Say something nice to your cousin Shirley
Dietrich: For a fat girl you sure don't sweat much.
Cue sound of Head slap.
RIP Muggsy & TMan
"If you are a warrior legally authorized to carry a weapon and you step outside without that weapon, then you become a sheep, pretending that JOCKO will not come today."