Small + QUIET to kill rats at close range ?*?

-set a lot ofsticky traps(like 2’x2’ pads)where they would flee or exit towards.
-get a fully automatic pistol bb gun(not a pcp) or a fully automatic airsoft pistol with a battery operated drum mag
-shoot at them from wherever these tight spaces you find them.
-watch the survivors flee into those sticky traps
-shoot the stuck one(execution style)
-repeat

you can also hire a professional or you can just forfeit your property.
 
@Cascadians - what state and county do you live in? That would be helpful.

I suggest importing some fixed cats from the local humane society. Tell them you need vicious mean nasty Toms for aome serious action.

Turn them loose and follow up with the Diana Chaser with a red dot.

Have fun!
State: OREGON; County: CLACKAMAS

We did have 2 cats. Maine Coons. Helped, but they didn't take on the big rats. I'm surprised the owls don't come feast.
 
-set a lot of sticky traps (like 2’x2’ pads) where they would flee or exit towards.
-get a fully automatic pistol bb gun (not a pcp) or a fully automatic airsoft pistol with a battery operated drum mag
-shoot at them from wherever these tight spaces you find them.
-watch the survivors flee into those sticky traps
-shoot the stuck one(execution style)
-repeat

you can also hire a professional or you can just forfeit your property.
Good idea to use sticky traps to catch since I'd shoot them immediately.

"fully automatic airsoft pistol with a battery operated drum mag" == could you please recommend one?

I am so gun ignorant, busy looking up terminology for every post. Really need specific recommendations for small and QUIET.
 
You are probably going to create a bigger problem shooting them, because the ones you wound will likely end up in your walls and die creating one hell of a stink (bigger problem). Buy these on Amazon. First use the spray, basement, attic, then the rest of the house. Stop feeding them, then use at least 3 to 4 bait stations around the outside. Keep the stations full of poison. Feed your dog inside and put his food in a plastic garbage can. If you are feeding birds discontinue. Best of luck
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chinchillas or weasels? maybe a jack Russel
I saw a video of a rat terrier killing dozens of rats in a stall fast plus a video of normal mutts doing it. Dogs are much faster killers than cats and no runaways to stink in your walls. See if anybody around has dogs that are rat killers. Saw a video of a mink used to root out and kill rats and a dog assisting. The mink got so hot he had to have a 5 gallon bucket of water to cool it off or it would die. The guy contracted out his mink for this. They do have traps that can catch multiple rats in one setting and of course there is that bucket trap you can make. If no person or pet can enter, I would be tempted to put a 110 V hot wire over bait and wet the floor under the wire. When you cut down their numbers, seal the area and remove all food source. That is what exterminators do: kill the pest and then pest proof the area. Wish I had some rats or pigeons I could shoot.
 
Problem is if you shoot them and miss you will shoot through the vinyl fence even at low velocity and light pellets. Can you put 2“ x 8” wood in front of the fence or areas you plan to shoot them? If so, then a gun might work but those automatic BB guns or AirSoft guns won’t phase them so don’t waste your money. If you call Pyramid Air be sure and tell them about the close fence. I doubt they will recommend any guns if they know about the fence.

Call more exterminators. I would use bucket drowning traps or poison.