I heard the G-men use one of these for pest control. Things like beaver, swamp rat, and such.
https://www.airforceairguns.com/The-TalonSS-By-AirForce-Airguns-s/38.htm
Fingertip adjustable power knob. But single shot, and not cheap.
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Last edited by DollarShort; 04/10/18.