Just an observation.\n\nI thought the OEM polymer sight that came on my 17.5 was just a dumb idea to make it so narrow. So much so I even purchased a Gen 1-4 rear sight to replace it.\n\nI replaced the sights with a set of Ameriglo Agent GL5517 a few weeks ago (BTW,they are on sale again!). They are just the like FBI contract sights.\n\nThe narrow rear sight totally makes since now. It blends in to the top contours of the slide perfectly. Great design.