Link down timing would/should not be affected. With the barrel in hand and the slide stop pin in the link, hold the link back against the lower lug stop. With either type fitting the link should be out of room, not actually tight but snug to the pin. If so, the link will in either case, bring link down at the same time. The difference is in the chamber cycle.Do you think the timing is altered? If so for the good or bad?