"spysir"You couldn't pick rigs much more different, except for weight.
Gauntlet comes standard with a regulator ( and needs no work out of the box ) is a bit long for dense woods carry but otherwise would work very well.
Bullpups, if you must. You'll pay the extra $100 ( + install ? ) for the bullboss reg and you want a regulator so figure that in.
.25 is over kill for your stated purpose and does have it's own disadvantages.
Many of the sub-$100 pumps work well, I like the tasau ( sp?) better than the Hill or FX, do research that.
For target work and rabbit/squirrel sized things) I would take the gauntlet as a "rifle" feels better and is easier to use for me. I haven't read of one actual mechanical failure - not related to owner use- not even an oring except the pellet probe & those wear. A better track record than most "$2,000" rigs these days.
Gauntelt is extreamnly easy to work on, dont know the boss unit.
John