Learned something tonight. I thought all Colts used the big pins.Be careful! Not all Colts are large pin. My 10 year old 6920 and my ~35 year old SP1 are both std pin. I think only from the early 90s to somewhere in the late 2000s did we see large pins.
And as far as reliability. In the mid 90s, I took two Colts to a 6 day LE Tactical Rifle course. A primary and a backup. Within 1 hour after the class started I loaned my backup to a fellow officer after his Franken build failed. These were the only two Colts in the entire class and the only two that did not encounter some sort of failure all week long. One officer went through 3 from his department.
I'm not doubting the reliability of Colts, just that they are different in some respects.
I've got thousands of rounds through my franken guns with no failures attributable to anything but ammo.