The original Remington 870 shotgun was designed in a way that allowed the shotshell to get jammed between the carrier and the bolt. If you tried to remove the shell, it would be a rather difficult process. If you ask anyone who used Remington 870 shotguns before the 1980s, they’ll tell you that it required a user to disassemble the shotgun. Don’t do what a lot of gun owners do and just slam your shotgun onto a hard surface because that will damage the action bars.

Eventually, Remington corrected this jamming issue with their invention of the Flexitab system, or known by other names like the Flex tab system and the anti-jam system. The first mention of the Flexitab system was in a manual written by Jerry Kuhnhausen called “The Remington M870 and M110/11-87 Shotguns, A Shop Manual.” In this manual, Jerry talks about how this Flexitab system was first created specifically for enhancing shotguns used by law enforcement. However, by the mid-1980s, the Flexitab system had been integrated into all consumer-grade Remington 870 shotguns.

Of course, the older Remington 870 model did not jam all the time. But as the gun continued to get used a lot, the shell stops had a tendency to loosen or the shell would not be seated properly inside of the magazine tube. Once this happens, a shell may come out of the magazine tube at any time, causing it to get stuck in between the shell lifter and the bolt’s bottom. The end result would be a jammed shotgun since the bolt would likely be near the battery.

This problem was really ignored for a long time until law enforcement shotguns were getting too old and new police recruits were not sure how to handle them. While Remington was only willing to modify the shotguns used by law enforcement, they said that their recreational shotguns didn’t have the same problem. Eventually, they were proven wrong.

The Flexitab system contains a carrier with a notch shaped like a “U” on the bottom, a slide assembly with side clearance cuts, and a modified bolt which is notched at the bottom.

Remington 870 Flexitab bolt is notched at the bottom

Remington 870 Flexitab bolt is notched at the bottom

Remington 870 Flexitab Carrier with U Notch

Remington 870 Flexitab Carrier with U Notch

Remington 870 Flexitab Slide Plate Clearance Cuts

Remington 870 Flexitab Slide Plate Clearance Cuts

If you are trying to get experience with working on Remington 870s, you should learn about the Flexitab system and its parts and guns. Those with an old Remington 870 that want to upgrade it should search online for the proper carrier conversion kit which features the right parts for the upgrade.

If you install the Flex Tab conversation kit then you can solve issues with the shell without having to slam your weapon onto anything. The Flex Tab kit contains three special parts that work together; the breech block assembly, the slide assembly, and the carrier assembly. All you need to do is replace the older parts of your Remington 870 Wingmaster/Express shotgun with these newer parts from the Flex Tab kit.

Recommended Product:
Remington 870 Carrier Conversion Kit, Flexitab

Remington 870 Carrier Conversion Kit, Flexitab

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