New Sidearmor 6-shell rail-mount carrier for Benelli M4 rail system.
I bought this to mod to a std. rail, but decided not to use it. It's designed to mount on the Sidearmor Mod 2 rail system, and a std rail would have to be drilled for one of the screws to clear. This thing is a tank- ball detents for the shells, bulletproof clamps, and rounded edges.
Purchased new from Sidearmor for $59.95- sale for $50 shipped.