depending on your intended purposes (bird hunting, sporting clays, skeet, trap, etc.) an 18 inch barrel compared to a 26 or 28 inch barrel isnt going to make a whole lot of difference. if you're claiming it as a "sporting rifle" on your paperwork and are actually going to use it in your home then i can see a possible complaint about the extra 10 inches but otherwise it isnt going to make much difference. despite what hollywood says, shortening the barrel isnt going to expand your shot spread dramatically...not movie dramatic anyways. the spread can be more effected by your choke. here is an example chart that shows the differences.