I have the same gun. Also tried looking for a pistol grip...no luck finding one.
Mine has been a turkey and duck killing machine for me.
I use a kicks 660 with Winchester extended range #6s. I also used to shoot 2 3/4 lead Winchester XX 4s out of a Comp N Choke XX full. Killed quite a few between 40 to 55 yards. Ive killed about 25 gobblers with that gun since 2000.