I saw they made a 6-shell holder, and a "shorty" 4-shell holder, but couldn't figure out why anyone would get the 4 over the 6 (same price). When I put the 6 on my Rem 870 today, I discovered why- the pump handle can't cycle all the way with the full-length 6-shell holder in place, so apparently the 6-shell holder is only for the 1100, 1187, and other semi-autos - for the pumps, you'll need the 4-shell holder. Damn....20% restocking fee