In the VersaMax model, which can handle 2-3/4-, 3- and 3-1/2-inch shells, there are seven ports along the chamber wall. When a 2-3/4-inch shell is fired all seven ports are exposed and feed the resulting gas into the gas block and its pistons. Firing a 3-inch shell results in only four ports being exposed and available for gas transfer. With a 3-1/2-inch shell, only three ports are open.

The VersaPort design also moderates recoil by venting off gas right at the chamber. This means excess, high-pressure gas is bled off immediately, reducing recoil and minimizing piston fouling. In fact, if absolutely necessary, it only takes a couple of minutes to pull both pistons and clean them and the gas block cylinders in which they operate. It’s an ultra low maintenance system.

The VersaMax shotgun line has been popular, especially with waterfowlers. Yet, it’s a large gun and expensive with pricing ranging from $1,400 to $1,700.