I own eleven suppressors at our place in AZ from when I used to live in America. I made some mistakes along the way, mainly with some cheap or multi caliber suppressors. I had wait times from 22 days to 14 months. I haven’t bought any since 41P in 2016, so my specific suppressors might be out of favor now.
.22 suppressor - must have. I purchased a Liberty Kodiak TL as my primary on a 4” AR22 SBR, of all the guns I have this is my favorite combo. The Liberty has proven very durable even without regular cleanings. I have another cheapy .22 can with an aluminum outer tube that is fine for a low volume pistol, but I shouldn’t have bothered with it.
9mm suppressor - should have but a .45 suppressor can work and .45ACP is already subsonic. Omega 9K on a Scorpion SBR, Liberty Mystic on a 5” AR9 SBR, Octane 9HD for the CZ or Glock, and a Tirant that works fine but is hard to clean. The Tirant was very inexpensive, but I shouldn’t have bought it. The Omega 9K is awesome. I bought the Liberty Mystic 9mm multipurpose suppressor as one of my first ones. It worked fine and is easy to clean, but it’s larger than it needs to be for most calibers. I never did the upgrade to the next generation baffle and tube cut from Liberty.
45 Suppressor - must have. Octane 45HD, great on the FNX 45 Tactical or Glock 21. Also works fine on 10mm (not subsonic) and 9mm as needed. Suppressing centerfire pistols is the least rewarding experience. You usually get hot shit coming back on you.
5.56 - buy the 7.62 instead. I have a Saker 556 on a 10.5” AR SBR. It works great, but the extra length of the 7.62 wouldn’t really make a difference and it’s about the same volume.
7.62 - yes please. I have a Saker 7.62 for the AR10 and use an Omega 30 for my 6.5 bolt gun. I like both but if I were just buying one I’d choose the Saker so I could beat it up more on a 5.56.
12 Gauge - the Salvo 12 deserves a mention for fun factor, but isn’t necessary or practical. The 8” configuration on my 11.5” Saiga S12 SBS is pure stupidity. I got thrown out of the Fudd trap range with it a couple times.
In summary: dedicated .22, 45 pistol can, and a 7.62 will handle most things. Regardless of 45 or 7.62 get an 300 blackout rifle, preferably an 8” SBR, and shoot subsonic ammo. Omega 9K is awesome, but I never tried it with .300 blackout. In reality once you buy the first couple you’ll end up with 6 before you know it. Don’t compromise along the way, used suppressors have little to no value since people can buy brand new for not that much money.