Mossberg continues to be on the cutting edge of firearms design. After their introduction of the MVP last year I wondered if they were out of ideas. Not! The new FLEX shotgun system allows end users to on convert a Mossberg shotgun to any configuration you can think of in about 60 seconds. This is made possible with a quick. Change forearm and a TLS (tool less locking system) for butt stock interchangeability. It’s a very neat and innovative concept that essentially makes Mossberg shotguns the ARs of scatterguns.