These shotgun side bases are designed to attach securely to the side of the receiver, providing a reliable mounting point for the Convert-A-Mount top brackets (sold separately). This versatile system allows you to easily exchange or remove optics in seconds, enhancing your shooting experience with quick adaptability. Please note that drilling and tapping may be required for certain firearms, ensuring a precise fit and stable installation. Elevate your shotgun's versatility with these side bases, making it simple to switch between different optics as needed. Experience the convenience and functionality that this innovative mounting solution offers, tailored for shooters who value flexibility in their setup.