Metal prices are going up, energy prices to build the gun are going up, etc. but that only accounts for a fraction of the increase in price. I know that I am cinical but I think it is a business decision; increase the price until sales drop off then stabalize there. As rdc pointed out, customers are still buying them so the price isn't too high.
That's just my opinion, and along with 25-cents it won't get you a cup of coffee.
Genises 27-3: Now therefore take, I pray thee, thy weapons, thy quiver and thy bow, and go out to the field, and take me some venison...