The Remington 11-87 is a semi-automatic shotgun manufactured by Remington Arms. It is based on the Remington 1100 and was first announced in 1987. The 11-87 is a gas operated semi-automatic (autoloading) shotgun, meaning that some of the high pressure gases from the burning gun powder are diverted through two small holes in the under side of the barrel. The gases force a piston (and the bolt) toward the rear of the shotgun, which in turn ejects the spent shell. A spring then forces the bolt forward, sending a fresh shell into the chamber. This gas operation has the effect of reducing the recoil felt by the shooter, since the total recoil energy is spread out over a longer period of time than would be the case with fixed breech shotguns.
The R11 87
thumb|300px|right|M11-87 in action (not pump action)