Halo side saddle made from anodized coated 6061 T6 aluminum. Mounts using existing screw holes in the top of receiver. Sleek skeletonized side saddle design. Two mounting locations on ejection port side; five on the non-ejection port side. Nine modular Add-A-Shell shotgun shell holders with anodized finish. Six inch side saddle aluminum top rail with anodized finish. Fits Mossberg 500/590 12 gauge shotguns. Manufactured in the USA.