I think I would get a three hundred fifty dollar one and fabricate my own mount. Or, get with a machinist and fabricate a high pressure fifty caliber air gun and attatch it to that.
Then with servos you could harvest them on frozen winter nights with the cold to preserve the meat (although I guess you would still need to get out there and bleed them).
No pigs equals big gardens that are impractical with the current swine infestation.
Recoil would destroy a system not designed to take it only after a couple of shots.
FLIR (the type, not the company) systems (something I am EXTREMELY familiar with technically in aircraft aiming systems, as I work for a defense contractor) are a lot more fragile that one would think.
The recoil would destroy the average flir after a couple of shots.