Most shotgun barrels are threaded for screw–in choke tubes, making them truly versatile tools. By simply swapping chokes, shooters can use the same gun for a wide variety of shotgun sports. While changing chokes is easy, deciding which choke to use can be difficult due to the wide array of choke choices out there.Gun barrels & choke tubes for shotguns and other firearms at cheap prices. Discover easy to install shotgun barrels, shotgun chokes and firearm choke tubes from Click-Click-Boom that are designed to produce a more consistent pattern.