The best replacement for pistol grip is stock shotgun.

The best alternatives to pistol grip are rated as following:
★★★★★  stock shotgun
★★★  rifle grip
★★★  french grip
★★★  stock rifle
★★★  mid handle drill
★★  full stock
★★  english stock
★  straight grip
★  ball head
★  stock home defense
★  english stock shotgun
★  buttstock
★  straight stock
  ball head tripod
  stock mossberg
  standard stock

Your alternative for pistol grip is not listed? Suggest!
Speaking about pistol grip, one probably shouldn't forget about stock.

Other search terms related to pistol grip and their ratings are:
★★★★★ stock
★★★ stock for mossberg 500
★★ stock for remington 870
★ tripod
collapsible stock
fixed stock
folding stock
You have in mind a companion for pistol grip and it is not yet here? Propose!



Google Trends

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pistol grip
stock shotgun
rifle grip