Competition Carbon Plus 12 (total) Round - with Picatinny

Price: $229.95
100% Made in the USA
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This extension is designed to allow a total of 12 rounds in the shotgun. The system includes a dual Picatinny rail with QD attachments for slings. The Picatinny can move at least 270° around the tube and for optimum positioning and is locked down firmly by a castle nut using a dedicated supplied wrench. Very light and weighs in at only 9.6 ounces.

Beretta, Franchi, Stoeger length is 20" Benelli length 22 5/8"
Holds 12 rounds total