a firearm 10 incorporating an electro mechanical trigger mechanism in one embodiment the electro mechanical trigger mechanism 40 resides within a hand grip 12 the electro mechanical trigger mechanism 40 comprises a solenoid 26 which is in communication with and controlled by a processor 28 such as a central processing unit cpu and is also connected to a hammer 20 and a trigger 22 via a sear disconnect 24 a firing mode selector 14 provides an apparatus for switching operation of the firearm 10 between a safe mode a semi automatic mode and an automatic mode as determined or required by a user of the firearm 10 the solenoid 26 is also connected to a plunger 32 which extends between the solenoid 26 and the sear disconnect 24 in one embodiment the solenoid plunger 32 can be biased towards the sear disconnect 24 by a coil spring or an elastic member the hammer 20 includes a primary sear abutment 56 and a secondary sear abutment 54 and is pivotally mounted by a transversely oriented pivot pin 35 the sear disconnect 24 includes a secondary sear 46 and is moveable between a catch position and a release position in the catch position the secondary sear 46 engages the secondary.