S&J Hardware Mossberg 590 +2 Mag Tube Extension
Mossberg 930 Plus 2 Mag Tube mk II
CNC machined from solid steel.
3 position front sling mount. No jam mag follower and spring
Will fit Mossberg 930 12ga
+2 is 4.75inch and is designed for pre 2017 590/590a1 or 835
Rangeview Sports Canada
License Gun Shop in Newmarket, Ontario