At the sporting clays events I see shotguns of all types and varieties, many of which have those pretty extended choke tubes sticking out the end of their barrels.

Many are multicolored and some even have holes like a compensator. They may extend an inch or so out of the end of the barrel. Since the majority of shotguns come with chokes inserted in the barrels, and flush with the end of the barrel, I am wondering what the extra inch does for the shotgun. They certainly are expensive, can cost upwards to $100 each so if you want to keep several different sizes around you will have a big investment. My question is is it worth the extra bucks, is their a measurable benefit?

Your thoughts?