Remington's upcoming VERSA MAX shotgun features a new self-regulating gas system called Versaport.
Versaport works simply enough: multiple gas ports are so far forward that a 3.5" shell will block most of them, a 3" will block some and a 2.75" shell will block none. This allows a greater percentage of gas from the low powered shell to operate the piston and restricts the gas from higher powered shells. Simple but effective.
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