"If you look at a picture of a car and it has tail fins, you know it was from the 1950s. If you look at a picture of home interiors and they’re full of shag carpet and avocado-hued appliances, you know they’re from the 1970s. Nowadays, if you look at a photo of a pistol and it looks like the slide lost a fight with a CNC machine, you know it’s from the end of the Twenty-Teens.Go and RTWT!
I’m not exactly sure who actually originated this fad, so I’ll blame Glock.
It didn’t actually start with Glock, mind you. IPSC and USPSA open shooters, in a never-ending quest for flatter-shooting guns and wanting to shave every possible picosecond off cycle time, were lightening the slides on raceguns since way back in the day.
But, it was Glock that brought lightening cuts in slides to the masses at the gun counter via its G17L and the later “practical tactical” G34 and G35. While these pistols were developed with competition in mind, the primary rationale behind the ovoid windows in the top of their slides was more prosaic than that..."