ARES M320 40mm Airsoft Grenade Launcher - Tan gas rifles the MK16 has many improvements

the MK16 has many improvements over the M4 and the M16

With such a low operating pressure

see the photos below

This Model is Extra Wide to allow room for Scoped Rifles

ARES M320 40mm Airsoft Grenade Launcher - Tan gas rifles the MK16 has many improvementsFeatures Metal alloy and nylon fiber construction Adjustable stock with comfortable rubber pad. Removal of stock allows mounting of grenade launcher to most rifles as an underslung grenade launching device Ambidextrous release allows the tube to pivot to the side, assisting with reloads of new shells Barrel cover attached by steel wire so the barrel doesn't get dirty when not in use Flip up front and rear sights, ambidextrous safety and ergonomic