Beretta Perennia/Preveil Stock Drop Adjustment Drop Kit Orange/Green. Specifications for Beretta Perennia/Preveil Stock Drop Adjustment Drop Kit: Manufacturer: Beretta Color: Orange/Green Gun Make: Beretta Features of Beretta Perennia/Preveil Stock Drop Adjustment Drop Kit Use the orange plate in order to raise the stock (reduce the drop) by around 1mm comb and 2mm hell. Use the green plate in order to lower the stock (reduce the drop) by around 1mm comb and 2mm hell. Package Contents: Beretta Perennia/Preveil Stock Drop Adjustment Drop Kit Beretta E00422: Perennia/Preveil Stock Drop Adjustment Drop Kit Orange/Green