That is true to a point, but I believe they’re the same or very similar to Injector blades. The difference is the length of the blade. IIRC AC blades were originally just Injector blades made longer to approximate a straight razor with disposable blades for barber/beauty shops. It’s too bad the Injector format became so overshadowed. I think there is the potential for some really amazing safety razor designs using those blades, but they’re just not popular enough for most artisans to spend their time and money producing.it sounds like (1) AC blades and razors are newer so we're not as far along the learning curve in razor design