I'll have to look into the KART idea.
Combat Jack. I fully appreciate what you say. However, it was/is my intent to do little or no alteration to kinda preserve the "original" nature of my old Series 70. So, if I can do something that doesn't require alteration the the colt, I'd rather try that first (understanding the self imposed limitations). I fully intend to acquire (soon) a top end 1911, for future use in target work. So, I would anticpate that my serious shooting would be done with that gun, and leave my old Mark IV stock/original.
This might not make sense to alot of 1911'ers, but it's just my way of thinking, I guess.