The M4 Tactical Adjustable Telescopic Stock for the Benelli M4 shotguns is adjustable for three different positions: fully collapsed, mid position and fully extended. The installation of the M4 Tactical Adjustable Collapsible stock does not require tools and can be accomplished in just a few minutes if you are familiar with your Benelli M4's takedown. A dramatic improvement to overall length and length of pull over the original fixed stock of the Benelli M4. Everything needed is included in the box with this collapsible stock kit.