The Mossberg FLEX 500 is one of the three current versions of the popular Mossberg 500 pump action shotgun series. The Mossberg FLEX 500 features a TLS Locking system that does not even require any tools to use. This locking system allows the shooter to quickly switch their recoil pads, forends, and stocks without much hassle. The core component of the shotgun is the receiver. Everything else can be reconfigured or upgraded if you simply know how to do it. A lot of people like to switch around the barrels, recoil pads, forends and buttstocks with higher-quality ones than the OEM versions that come with the weapon. With the right mixing and matching of parts, you can convert your Mossberg FLEX 500 shotgun into a weapon that is suitable for home defense, hunting, bird shooting, or law enforcement use.