12 ga, Pump, 5+1, 18.5" barrel, grey. Mossberg has teamed with ATI to outfit these models with an exceptional set of coordinated components: T3® TactLite® 6-Position Adjustable Stock, Pistol Grip, Heat Shield, Akita® Forend, Receiver- Mounted and Barrel-Mounted Rails, Halo® Side Saddle with nine polymer Add-A-Shell ® Repositionable Shell Holders.