I'm sure it's just model variations. The MK is probably a newer model than the K's and they decided to forgo the laser engraving, perhaps a cost cutting measure.
The take down levers I can't explain as we see the ones where the pin rotates on the lever and is held in place with a little keeper pin and the solid ones mixed all the time. I don't know that one is any better than the other as the barrel link rotates on the pin.
I'll have to check my K's again and see, don't remember. I'll also look over my new T, I took it apart for an examination but didn't take note of the take down lever or the engraving far as that goes.
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."