I have seen the gun with the added pistol grip that Tom described, and liked both the look and the functionality of the added piece. If they were available today, I would buy a couple to go on my straight stocked LC Smith 2E and my straight stocked M21 Trap Grade,as well as my Mod 1897 straight stocked Trap Grade. I have owned a number of straight stocked guns, and shot them well enough, but on a 12 gauge gun, I prefer the better control of recoil that a full or half pistol grip gives me.
The pistol grip accessory that Tom described was well made, and finely checkered, and made of some black material that looked like hard rubber or gutta percha.