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So there's been a lot of attempts at making scifi gun clones like replica Halo weapons in real life, usually by slapping 3d printed bits on extant firearms.

My issue with these kinds of things, as much as they're pretty cool, is that they rarely integrate much useful "tech" that justifies the fancy get-up. My question is this: how many gadgets that are theoretically practically useful could you shove into builds of this variety? Obviously, things like flashlights are pretty easy, and lasers and optics are also pretty commonly included, but what about things like laser rangefinders, round counters, and other more bespoke, "cutting edge" features? (I know that a few have tried there was that guy who made a Halo magnum with an attempt at a round counter HUD on the rear plate of the slide, but if memory serves it was pretty unreliable)

On a related note, regarding personal equipment, would it be at all practical to integrate things like communications equipment, earpro, and potentially things like a gas/dust mask into the form factor of something like a motorcycle helmet? Obviously plenty of extant helmet systems achieve similar things, but would fitting those features inside the profile of an enclosed helmet even be possible?