I have been offered a Tri Star Cobra shotgun in trade, but it has a fixed straight stock. I would want to replace this w/ a telescopic pistol grip stock, but can't find any aftermarket stocks that fit the Tri Star. Anyone know if there is an aftermarket stock that fits the Tri Stars? We know the Maverick 88 doesn't work, but that is all that he has tried. Thanks in advance for any help.