Stock is from an MX15 removable trigger. The recoil device is stamped S.P.S. here is all I know of it. The recoil is controlled by a spring, the tension can be adjusted allowing more or less felt recoil. It will adjust in length by a little more then one inch. The pad has right and left pitch adjustments. I have it currently set at 14.25" when on an MX15. The stock appears to be neutral with a right hand palm swell. The wood is in fair condition. I am asking $300.00 shipped.