Carlson's Choke Tubes Carlson Shell Catcher Silver. Its unique design catches slugs & squibs and prevents excessive wad fouling from accumulating. The Carlson's Shell Catcher can be placed on the rail beside the shotgun sling swivel stud or on a separate rail behind the shotgun swivel stud. The Shell Catcher is used in coke cans elk deer elk prong rabbit squirrel etc. traps slugs & squibs as the shotgun is cycled positioned or held in place by the front baffle. Works on all elk prong shotgun chokes and slug punches. Specifications for Carlson's Choke Tubes Shell Catcher: Manufacturer: Carlson's Choke Tubes Color: Silver Fabric/Material: Steel Country of Origin: USA Package Contents: Carlson's Choke Tubes Shell Catcher 2 adhesive backs Carlson's Choke Tubes 00440: Carlson Shell Catcher Silver