The gun in question will be the Ruger PC Carbine in 9mm. It's more for my girlfriend than me, but namely for use inside our home if necessary.Even in a 16" barrel the sound signature may be reduced but I don't think it's going to be hearing safe. A suppressed pistol caliber carbine is nice and quiet if done right and is especially beneficial if it's your go to gun in an emergency indoors or in a vehicle. A few companies even make integrally suppressed barrels/uppers that have ported barrels inside the suppressor like the MP5SSD which slows down standard supersonic ammo to subsonic speeds. Depends on your caliber too, most .45acp is already subsonic while 9mm has heavier grain rounds that dip into sub territory.
I do reload which is what made me think it might be financially feasible.Yes, it can be worth it, but I would say only if you handload, as a 16" tube will make many subsonic rounds supersonic. My Marlin Camp 45 with standard ball ammo is louder suppressed than any of my .45 pistols suppressed. The same is true of my 9mm pack rifle with 147 gr. loads that are sub from a pistol barrel but not a 16 incher.
I have fired suppressed guns so I am aware of their limitations. Indoors I'll take every advantage I can get, assuming the net benefit is worth it. I won't be chopping down the gun any. It's something I hate doing.1)While supersonic suppressed isn't hollywood quiet, it's still quieter than not suppressed.
2)If you want subsonic shortening the barrel and pinning a can, or adding an extension like the
Tactical Solutions TSAR or 10/22 barrels gives you quiet in a short handy package. I'm thinking hard about doing the latter to one of the new Ruger PC's.
You are likely getting ejection port noise. Try a stronger recoil spring and see what kind of a difference it makes.My Marlin Camp 45 with standard ball ammo is louder suppressed than any of my .45 pistols suppressed.