Briley Modular Forend Cap Weight for Beretta AL391 12 Gauge and 20 Gauge
 
Adjustable Forend cap weight for Beretta automatic shotguns. Components are manufactured from 416 stainless and the whole unit weighs 4OZ. You can disassemble it so as to clean it. To increase its weight simply purchase one or more of Briley's generic 2OZ weights (listed in my store). You simply unscrew the aluminum cap, add your additional weight/s and screw the cap onto the last weight.