Originally Posted by
mimms2
Couple of points I'll argue (while I watch plaster dry)
I have the oldest chinesest .177 slug gun, it's a piece of shit with, by any standard, a shit trigger. It is, however, quite shootable. It's long and heavy and wiggly and has miles of overtravel too, The trigger is literally the sear, holding the full weight of the mainspring. But it can still group "minute of coke can" all day at 25m.
If you can't do the work yourself, maybe.
But even many of the budget hack-guns will benefit, as you say, from a basic polish, square off and shim the springs, renew seals, crown. All of which are within reach of the can-do kiwi.
Actual tuning... spring rates etc, by the time you fuck around with that you may aswell have bought a better gun in the first place.