Importance of a handstop
When a shooter transitions from shooting longer rifles and shotguns to SBR (Short Barreled Rifle) and SBS (Short Barreled Shotgun) types, a handstop may play an important role in preventing an injury.
We learned this lesson the hard way when we shot a 10.5-inch-barreled M16 many moons ago. After dumping 10 magazines on full auto, we raised our weapon to the port arms position and instead of grasping our more familiar A2-profile handguard, we received a handful of white hot compensator goodness. The scar faded, but the lesson has not.
One of our favorite handstops for this type of use is the BCM Kinesthetic Angled Grip (KAG). Although designed for use on an AR pattern rifle with a C-clamp type grip, we mount these in reverse when using it in the role of a shotgun handstop to prevent the hand from going forward of the muzzle.