Add the capability to carry more spare ammo on your tactical shotgun, along with an optics mounting rail with this package from Advanced Tactical. It includes a Halo Side Saddle, a modular Add-A-Shell set that allows you to add up to nine shells in any configuration, and a side saddle top rail for mounting optics or accessories. Made in the USA.

Specifications and Features:
All components precision CNC machined from 6061 T6 aircraft aluminum
Military type III hard-anodized finish
Sleek, skeletonized side saddle design
Three mounting positions on ejection port side
Six mounting locations on the non-ejection port side
Holds shells firmly in place
Mounting location for 6" top rail
MIL-STD 1913 Picatinny rail
Mounts using existing screw holes in the top of the receiver

Fits:
Mossberg 500 and 590 12 gauge shotguns