I guess this is for competition shooters.

Designed to work with all Model 870 shotguns, the Trigger Fix allows the user to have a clean, smooth, fully adjustable trigger pull. Every Timney 870 Trigger Fix is packaged with a sear, 3 pull weight springs and a hex head wrench. Simply choose a spring (light, medium, or heavy) and then fine tune the pull weight with the hex head wrench for a precise setting.

Price is $89.95.

*[ Many thanks to the reader who email me the info. ]

UPDATE:

Shooting Illustrated has reviewed the trigger upgrade …

Similarly, the 870 platform is just as versatile for law enforcement, those interested in home defense and three-gun competitors. Whether you employ your 870 for one or all these tasks, and no matter how your 870 is configured, Timney’s new drop-in unit will fit and eliminate the weak link of an otherwise exceptional firearm.