OopsAgree with DC. A side shot that shows more would clarify but I to think it’s a Novak cut.
While your comments are true, they have nothing to do with the OP's question.These threads crack me up. I have been installing and using staked front sights and plunger tubes on 1911s for almost 40 years and have never had one loosen - not one. If you ever see either one one come off it is because whoever installed it didn't know what they were doing. Dove tail sights exist so that smiths can make money milling slides - or for guys who must have tritium sights.