Introducing Carlson's 12 & 20 Gauge auto Catcher-an innovative all steel solution designed to prevent the ejection of empty shotgun hulls through the receiver opening of semi-automatic shotguns. This ingenious device securely retains expended hulls, facilitating effortless removal. Compatible with a wide array of 12 & 20 Gauge semi-auto shotguns, it safeguards your shooting environment from clutter and distractions caused by scattered hulls, while also safeguarding your firearm's finish with its soft, padded tape that acts as a protective barrier. Installation is a breeze, simply affix the provided double-faced tape (two included) to your gun's receiver, which can be easily removed if needed. The auto catcher boasts adjustable features to accommodate various shotshell loads and firearms without necessitating any gun modifications. Its seamless design ensures minimal movement and vibration, eliminating the risk of receiver abrasions. Embrace the convenience and cleanliness this innovation brings to your shooting experience.