Airforce Condor .25 cal, All Airforce guns are very good and capable guns, I have the Texan .457 and it's been excellent, will be doing some Hog and Deer Hunting when I move to Texas next month,
you might try out several pellet brands, unless the previous owner told you what brand pellet or slug to use, they are very accurate with the stock Lother Walther Barrel and very powerful too,
Have fun with your new to you toy.....
Shoot Safely