I've never heard of a Colt using the large pivot pin and large fcp's. But that doesn't mean a few didn't slip out.
Bumblebee_bob know it was coming. I have a large hole colt for both the push pin and the FCP. It is a slab side colt it is an Hbar from like 89 or 90 The serial number is MH0242XX.
To answer one of Scotts question the gun had a compuss Lake triger(IE Bushmaster) in it, Bushmaster origanial removed the sear block to put there triger in. So I would say the jewel will have to have the sear block removed, just a guess thought naver done it myself. I hope my Colt LE gun does not require the block to be removed, I just ordered a rock river triger for it.
just my thoughts