Not the Verlinden version, but the Dragon one found in their M51 Isherman kit (they have a spare M50 turret along with the M51's turret). Will buy or trade.

I have one. I've also got an MP Models one but I haven't decided whether or not to swap them out on one of my M50 builds.
What have you got for trading? Here's wish list, but my needs are eclectic, and vary from week to week:
Tamiya or Academy Centurion upper hull piece
Gun stop rails from Tamyia or Academy Chieftain
Gun crutch from any Challenger
US pick axe heads, the more the merrier
Two British style shovels. Need detail on both sides,. (most are flat on one side)
PE antenna for WWII Britich tanks, sort of cone shaped
Two rubber tyres (no wheels) from AFV Club Centurion, or any spare track links from same kit
If you don't have any of these things, don't sweat it. I'll still send the turret.

All I actually have that you might want are some Accurate Armour Chieftain parts (the barrel, side skirts, and an Eduard ZOOM photoetch set), the Tamiya Chieftain kit itself, and AFV Club Centurion tracks and wheel set, which I intended to use to make an updated Centurion Mark 3 before deciding Tamiya's old kit wasn't worth it. Or I can send a check.

I wanted to build an original-type M50. Can I just stick the turret onto the DML Firefly kit, and which transmission cover type would be correct? What about using Tamiya's M4?

PM sent.