I've been using American Defense Manufacturing and LaRue Tactical for the quick disconnect and return to zero features but there are several good ones out there now for half the money.
I'm thinking post ban Colts were standard pin size as long as it has push pins. Seems like the large pivot pin was a screw setup but it's been awhile so it'd be worth checking before ordering. Just make sure the front pivot pin hole is the same size as the rear takedown hole.
It will have large trigger pins unless it's a later production gun.
