Yes
Only if...
No
Not even interested
Best way to fix them, I have found, is boiling water. I have heard of others experiencing shrinkage when doing it that way though. The advantage is you can straighten it in the boiling water then use cold water to harden it right away. I'm a little leary of the hairdryer method myself.
My Superion has a similar issue, so that suggests to me it could be a plastics problem. It might be that the toys are exposed to temperatures high enough to cause warping during shipping to Australia, the guns being particularly prone because of the length of the barrels.