5 cm choke. standard interior* from Benelli and Beretta.
These models are those that correspond to the Benelli, Premium, Bellmonte, Super 90, old Montefeltro, old Raffaello and Stoeger models, and the Beretta A300, Ultralight, 687 Silver Pigeon, Beretta 302, 303, 304, 390, 391 models , A300 Outlander, Beretta Super Post 686 and 687.
These competition chokes can be used on all Mobilchoke guns.