Remington Automaster Model 878 Shotgun Piston Assembly. Part is from a Remington Automaster Model 878 semi-automatic 12 gauge shotgun. Part is in good condition and guaranteed to be genuine and original. Photos are of the actual item you will receive. Please, examine the photos and if you have any questions about the listing or need additional photos, contact us. Seller assumes no liabilities. Know your local laws and use a licensed gunsmith.