This stock has a 12" length of pull which is shorter than standard. Mossberg shotguns with 6-3/4" forend tubes will require an adapter nut, product number 643889. Gunsmithing is not typically required for installation but may require various firearm-specific wrenches and other tools for stock and forend removal. In some instances the forend may not fit to the magazine tube. Hogue recommends the following fix: Using a Dremel tool, remove the ribs just inside the forend where the nut starts (approximately 1/4" down), this will allow the nut to slide down inside.
Note: Forend adapter nut 643889 will be required to install this forend if the shotgun's forend tube is 6-3/4" long