Choke tubes explained. Without a choke tube added to the barrel's end, there would be no way to control the barrel's payload. Beretta. Our comprehensive choke info guide helps you understand and choose the right choke for your needs. Discover comprehensive methods for identifying shotgun chokes. Shotgun chokes get a lot of discussion and there is a lot of misunderstanding about how they do their job and which chokes work best for given hunting scenarios. Browning Invector, Invector Plus, and Invector DS chokes. Most factory choke tubes are made of lessor stainless steel, which equates to a choke that won’t hold up to most steel shot loads or heavy buffered shotshells. Find out what the markings on choke tubes mean and where they are located. You might not care about shotgun chokes, but they care about you. The choke, whether fixed or interchangeable tubes, controls or alters the patterning of the shot that is sent out when a shotgun is fired.