same action the forward extension 30 moves downward causing the sear 22 to disengage from the hammer notch 24 and allowing the hammer 18 to be released and swung by spring force into contact with the firing pin each of these extensions 28 30 32 of the trigger 12 mechanically act in the form of a simple u201c bell crank u201d translating motion of one extension in a first direction into motion of another extension in a different direction the heretofore described parts mechanism and operation are standard to an ordinary ar15 type firearm the present invention provides a grip safety lever 34 that is pivotally mounted relative to the receiver 10 and or its pistol grip 36 grip 36 has a rear edge as shown the grip safety lever 34 is mounted on a pivot pin 38 which is carried by the lower receiver 10 an upper portion 34 a of the grip safety member 34 extends through a channel 40 fig3 formed in the lower receiver 10 and includes a hook 42 that is positioned to engage a safety notch or stop 44 formed at or near the rear end or face of the rear extension 28 of the.