need some help!!! I got a new New Englands Firearms Pardner Pump shotgun as a x-mas gift along with a knoxx recoil reducing stock. Problem is that I seem to have gotten one of the metric receiver studs and the stock will not screw into it. Does anyone know if a replacement stud can be purchased? I would love to put the new stock on the gun so wife would shoot and have longer time at the range with it. thx for the help!