how good a shot are you??
thats the answer.
You can put one wrap of mono and the range will be 3M, or more, and the spear will travel further.
I have shot fish 5M away with a 65Cm gun, and missed others at less than a meter! Probably on the same day...
A longer gun does give you a better "sight base" though and is more "pointable" I would guess that over the 105CM to a good 130CM (with a nice trigger) you could extend your equivalent accuracy by 1M?
good luck
