Hi Alexander and welcome. I would check with Akkar for accessories for the Churchill Shotgun. -- akkar.com.tr/stock-accessories-2-421 ------------ Cheers and stay safe!

Hi Alexander, you would need to replace the entire stock with this pistol grip stock >>> http://akkar.com.tr/pistol-grip-stock-2-633
Email AKKAR at sales@akkarsilah.com to check availability.
Stay safe & have a great day!

Try here: akkar.com.tr/stock-accessories-2-421

Good evening to you!! Replacement grips for your churchill shotgun can be found on Akkar website. See link below for more information. You can also check with retailers like ATI. An online search say CZ612 share common parts. Hope this helps. Have a good rest of your day.
🇺🇸🇺🇸 'Merica' 🇺🇸🇺🇸
akkar.com.tr/stock-accessories-2-421

Finding a compatible pistol grip for your Churchill 12 gauge pump can be challenging because its furniture is generally not interchangeable with popular models like Remington or Mossberg without an adapter. The Churchill shotguns are manufactured by Akkar in Turkey, and parts compatibility is mostly limited to other Akkar or some Hatsan models.
Direct Fit Options
The most reliable options are pistol grips specifically made by or for Akkar shotguns:
Akkar Original Grips: The manufacturer, Akkar Silah Sanayi, makes several pistol grip and stock accessories that are direct fits for their 12 gauge pump shotguns. You can check with European American Armory (EAA), the importer, or authorized dealers for availability.
"Turkish-made Shotgun" Compatible Grips: Some aftermarket manufacturers offer grips designed to fit "most 12GA Turkish shotguns." For example, the Raptor Grip "birds head" style grip has been marketed as fitting Turkish-made shotguns.