Replacement Set of 2 sear clips. One is an older style and one is a newer style. 

Each sear clip varies slightly. The different era CX4's will require a different clip, so one of each is included to ensure you have the correct model needed!

"We began to notice mid-2013 that newer CX4 rifles were arriving on the market with slightly varying trigger housing lengths. Some of the longer housings require an additional element in our Trigger Kit to ensure a good fit. This additional element is the Sear Clip. Not only does it effectively shorten the length of the trigger housing, but it provides a metal surface for the sear of our metal hammer to act against. Durability of the housing is thus increased, and customers also report a smoother action when the gun fires. 
The clip is made by our custom springmaker of specially hardened steel just a few ten-thousandths of an inch thick. It clips neatly over the edge of the housing, and is held securely in place by the fit of the housing in the lower.

WE DO NOT RECOMMEND INSTALLATION OF THE SEAR CLIP FOR ANY PURPOSE OTHER THAN IMPROVING THE FIT OF YOUR HAMMER. If the sear clip is not required specifically to shorten housing length, its installation will interfere with the smooth action of your hammer and worsen the feel of the trigger pull. One sear clip is included with each hammer/trigger/spring kit."