Editing Remington Model 870 (section)

==Design details==
The 870 features a bottom-loading, side ejecting [[Receiver (firearms)|receiver]] and a tubular magazine under the barrel. The gun comes with a plug for migratory bird hunting which reduces the magazine's capacity to two<ref>{{Cite web|url=https://www.fws.gov/le/hunter-responsibility.html|title=Office of Law Enforcement - The Hunter's Responsibility|website=www.fws.gov}}</ref> rounds. It has dual action bars, internal hammer, and a bolt which locks into an extension in the barrel. The action, receiver, fire control group, safety catch and slide release catch of the Remington Model 870 shotgun are similar to those used on the [[Remington Model 7600]] series pump-action centerfire [[rifle]]s and [[carbine]]s. The basic fire control group design was first used in the automatic [[Remington 11-48|11–48]].<ref>{{cite book|last=Michalowski|first=Kevin|title=The Gun Digest Book of Sporting Shotguns|year=2005|publisher=Gun Digest Books|isbn=978-0-89689-173-9|page=152}}</ref> Twelve gauge stocks will also interchange on the older 12-gauge-sized 20-gauge receivers, although modification is needed to fit the smaller sized 20-gauge receivers employed since the late 1970s. Several parts of the 870, such as buttstocks and magazine tubes, will interchange with the semi-automatic [[Remington 1100]] and [[Remington 11-87|11–87]].<ref>{{Cite web|last=Campbell|first=Ray|date=2021-05-01|title=Remington 870: Why The Best Shotgun Is Actually The Cheapest|url=https://www.topfirearmreviews.com/post/remington-870-affordable|access-date=2021-12-17|website=Top Firearm Reviews|language=en}}</ref>

The original 870 models were offered with fixed [[Choke (firearms)|chokes]]. In 1986 Remington introduced the new Remington "Rem Choke" system of screw-in chokes (also fitted to Remington model 1100 auto-loading shotguns at the same time). Initially, the Rem Chokes were offered only in 12 gauge in barrel lengths of {{cvt|21|,|26|and|28|in|mm}}. The following year the availability was expanded to the 20 gauge and included other barrel lengths.<ref>{{cite book|title=Remington Firearms Catalogs|year=1986|publisher=Remington Arms}}</ref>

The 870's production for over 30 years had a design flaw whereby a user could fail to press a shell all the way into the magazine when loading – so that the shell latch did not engage the shell – which could result in tying up the gun. This was caused by the shell slipping out of the magazine under the bolt in the receiver to bind the action, requiring rough treatment of the action or even disassembly. The potential issue was resolved with the introduction of the "Flexi Tab" carrier. Guns with this modification can be identified by the U-shaped cut-out on the carrier, visible from below the gun. The cut-out, combined with modified machining on the underside of the slide assembly, allows the action to be opened with a shell on the carrier.