The 11-87 is a gas operated semi-automatic (autoloading) shotgun, meaning that some of the high pressure gases from the burning gunpowder are diverted through two small holes in the underside of the barrel.[SUP][/SUP] 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 new shell from the magazine 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.[SUP][/SUP]
The 11-87 incorporates a self compensating gas system design, which allows the gun to operate with every type of load from light 2 ¾" loads up to 3" Magnum loads without any shooter adjustments. It is manufactured in two different gauges: 20 and 12, and both will cycle 2 ¾" and 3" shells. Some 11-87 shotguns, especially ones with barrels shorter than 26" or Magnum models may have issues cycling light target and birdshot loads consistently. The 12 gauge 3-1/2" SuperMag and 20 gauge Magnum models come with an extra part on the magazine tube called a "barrel seal activator" that helps cycle lighter loads. It is recommended you remove the barrel seal activator before firing 2 3/4" magnum, 3", and 3 1/2" loads; failing to do so may bring pressures to dangerous levels which could damage the gun. Recently, a Super Magnum version has been introduced to operate with the newer 3 ½" 12 gauge shells.[SUP][/SUP] Some 11-87s have interchangeable screw-in chokes, although barrels are available with fixed chokes. Most barrels are not interchangeable between 1100 and 11-87 models. Barrel lengths range from the police 14 in (360 mm) to 30 in (760 mm).[SUP][/SUP] The weapon was famously used in the Coen brothers' movie No Country for Old Men, based on the same book by Cormac McCarthy.[SUP][/SUP]
Thank you............for the very helpful information. I am planning to add a one or more rails to the handguard for the installation of a CTC "RAIL MASTER PRO" model #CMR-204.
I may also make some other modifications to my 1187 youth model 20 gauge, with a 21" barrel and screw in chokes.
This firearm has never been for hunting of birds. It's employment for me is Tactical Home Defense & Defense while wandering in the majestic Alaska wilderness. Therefore a light & GREEN laser is legal including predator procurement.