The stock has a removable barrel insert that allows for the use of a wide range of 10/22 barrels. Thinner barrels have the spacer in place so there are no gaps, while thicker, bull barrels do not have the spacer in place.
The underside of the fore end has a reversible insert. When in place, the piece will either match the rest of the fore end, or when reversed, will have a short Picatinny rail for the addition of a bipod or other accessory.