kozak6
The biggest advances will be to make guns cheaper.
Plastic frames and receivers are well established. Plastic trigger groups are starting to spread.
MIM will be improved and be even more widely used.
Carbon fiber (or something similar) slides on semi auto pistols. Not that I like the idea, but I see someone doing it. The Glock-oholics would love it.
I could also see electronic triggers make their way into shooting.
Gun powder (or something replacing it) that doesn't convert lots of it's energy to heat. No muzzle blast, no muzzle flash and no special equipment needed. Of course a substance that can rapidly go from solid to gas fast enough to launch a projectile but doesn't generate heat would revolutionize more than just guns. There could be such a thing as a stealth hand grenade.
I don't know about that. High pressure gases tend to make a heck of a lot of noise regardless of temperature. It's just that gunpowder makes it easy to make hot high pressure gases.