In a firearm, the sear is the component of the trigger group which resists pressure on the trigger. When the pre-determined amount of pressure has been applied, the sear will release, allowing the firearm to discharge.
The term 'sear' is sometimes (incorrectly) used to describe a complete trigger group.
If the sear slopes in the opposite direction as it does in a negative engagement situation, if the SKS is bumped or jarred the hammer is forced away from the face of the sear and the hammer cannot possibly be released!
This modification is sear intensive, so again I recommend you make the modifications to a spare sear in case irreversible harm to the sear is done.
As the sear moves forward, the teeter-totter is forced to climb up the "ramp" created on the top of the sear.
The lock is the heart of the muzzleloader because, in all cases, it is the lock which provides ignition for the main powder charge in the barrel.
The three major components of a lock are: the mainspring, which may be flat, V-shaped or coil type; the tumbler, which is notched and projects through the lock plate to the hammer; and the sear, which pivots its tip into the notches of the tumbler and holds the lock in the half-cock or full-cock position.
If a sear adjustment screw is provided in the tumbler of the lock, use it only to adjust the sear engagement to a safe level.
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