Those are definately "after market" sights. Note that the side of the M1911 says "U.S. Property". The US military did not purchase any newly made M1911's after 1945!. they all had fixed sights, and you might be able to find those from Gun Parts Corporation (gunpartscorp.com). But bear in mind that athough the rear sight can be drifted out and a new one drifted in, the front sight has to be peened in using a special tool. I built one with my trusty cutting torch and grinders, and it worked, but you can purchase the tool from Brownells, Inc (brownells.com). wktipton, SSG, USA (Military Police) Retired.