The M4 Tactical Adjustable Telescopic Stock for Benelli M4 clone 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 clone\'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. The M4 Tactical Adjustable Collapsible stock kit comes with 1 pistol grip. 1 pistol grip nut, and 1 buttstock. The Benelli M4 and most clones already have the different stock positions machined into the buffer tube, ready for installation of the stock. A good upgrade for those looking for the adjustable option or who just want the cool original design. Important - Before purchase, you should verify that your shotgun has the appropriate stock position grooves machined into the buffer tube. You will need to remove the factory stock to inspect the buffer tube prior to purchase. While the vast majority of Benelli M4 clones will have the appropriate machining, some early clones may incorporate a smooth tube that will not function with the stock due to the fact that there are no locking points. If your buffer tube is smooth without locking notches, a replacement buffer/recoil assembly can be purchased seperately HERE! Please note that during installation, there will be play in the fit of the pistol grip until the trigger housing is installed into the shotgun. This is normal, and the fit will be tightened during the installation of the trigger housing.