Interesting idea.
Modern firearms are more complex than blackpowder, but blackpowder has been around for quite sometime to include more advance repeating arms vs single shot. Those were developed without advanced CNC machinery.
I think silencers are overrated. I have a 10/22 with an air stripper on it. It is so quiet (with good match grade ammo) everyone thinks it is a silencer.
I have an air rifle in .22 that is so quiet, the pellet hitting the backstop makes more noise. A friend of mine has one in .25 that does the same.
Per my USMC training, when it comes to hand to hand combat, dont.