Mesa Tactical Saddle Mounts comprise aluminum brackets that wrap around the top of the shotgun receiver. The factory trigger pins are replaced by internally thread steel pins, to which both sides of the saddle rail are securely bolted. SureShell Saddle Mounts feature a MIL-STD-1913 Picatinny sight rail along the top, and a four-, six- or eight-shot SureShell shotshell carrier yoke on the left side of the receiver. The saddle rail is Type III anodized for a rugged surface finish. Mesa's Saddle Rail is specially contoured to allow operation of a semi-automatic bolt on the right side of the receiver, so it can be installed on Remington 1100 and Remington 11-87 semi-auto shotguns as well as Remington 870 pump shotguns.

 " I ran the Mesa 8 shot Saddle mount (91640) on my 870 at a recent class that lasted 3 days and hundreds of rounds. I ran an Aimpoint M2 and never once had an issue or problem."