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AR-15 or M-16 Bolt Carrier Auto-Sear Trip. It is used to trip the auto-sear in AR-15 Style Bolt Carriers. The unit installs in a few seconds and can be removed just as fast. It is held in place with 2 small set screws. Body of sear trip is made from BRASS. The trip is made from 1050 steel that has been hardened to a 55 Rockwell. Actual BRASS body of sear trip will be NATURAL BRASS IN COLOR, No Coating. Note: You are looking at a Steel Sear Trip body used only for these pictures, actual unit is natural Brass color.
Why spend 100 dollars on an M-16 Bolt Carrier when you can use any AR-15 bolt carrier and convert it to an M-16 Carrier for 1/3 rd the price. In addition, the Select Fire Auto-Sear trip adds some additional mass to the bolt carrier that is removed from the AR-15 carrier during the milling process.
The Sear trip comes with all the needed hardware and hex wrench that fits all 3 fasteners.