1911 mainspring?

[Adam Helmer]

GOB,

Let us go back to the beginning. A Colt 70s Mark IV Mainspring, you say. Ok, did you once-upon-a-time have such a spring? LOL. Did you contact Colt about same? Again LOL. What did Colt have to say about such spring, poundage wise?

You are correct, GOB, it is a "Mainspring" and not a "Hammer Spring" as I assumed. My fault. I would ask Colt and then go with whatever they say is "Good-to-go" in the Mark IV. I may have a GI mainspring someplace hereabouts and if I do, I will send you a PM. Be well.

Adam