Key Features: High quality FDM 3D printed ASA construction. LIFETIME WARRANTY Made completely in the USA by a veteran-owned business Used for adding a 6-position AR buttstock to Benjamin Marauder Pistol Polymer tube reinforced with steel bolt threaded into the airgun This kit includes everything you need to convert your Marauder Pistol into a custom carbine. The kit includes a 3d printed buffer tube and 5/16-24 X 6inch bolt. The Milspec Adjustable buttstock is sold separately. With a Magpul buttstock youll end up with a 11-3/8 LOP to a 15-1/4 LOP. It is made to MILSPEC dimensions. We highly recommend Magpul buttstocks for this extension tube, but it is compatible with any MILSPEC AR adjustable buttstock. You may need to use 1 inch tall scope rings for your optic with this stock installed.