This is the future rear sight for Benelli instead of the fixed ones.
Adjustable from 2.3 to 4.0 mm in 10 steps.
Further more you can lift the 'floor' of the sight to keep the picture square.
Require minor change to the grip.
Mobilchoke system -Before using to insert the flush or ported chokes with the same system.
Fits Beretta and Benelli with 7 cm inside part.
For all new models, Beretta OptimaPlus and Benelli Crio