Area 419 Bighorn TL3/Origin Bolt Knob Adapter Stainless. Its main feature is the finger groove which allows you to manipulate the bolt with just your pointer finger without searching for the ideal position each time. Your finger automatically catches in the groove to assure the fastest smoothest bolt manipulation. There are two knurled surfaces located on either side of the groove to give a sure grip. Specifications for Area 419 Bighorn TL3/Origin Bolt Knob Adapter: Manufacturer: Area 419 Fabric/Material: Aluminum Gun Make: CZ Gun Model: CZ 457 Hand: Ambidextrous Included Accessories: Standard Country of Origin: USA Package Contents: Area 419 Bighorn TL3/Origin Bolt Knob Adapter What firearm models does the manufacturer say Area 419 Bighorn TL3/Origin Bolt Knob Adapter is compatible with? The manufacturer says that Area 419 Bighorn TL3/Origin Bolt Knob Adapter is compatible with CZ 457Area 419 419-KNOBADT-BHSS: Bighorn TL3/Origin Bolt Knob Adapter Stainless