65 now when hammer 15 is placed in the cocked position thumb safety 38 may be rotated into the safety position causing the sear blocking stud 58 to immobolize sear 40 to prevent hammer 15 from falling on firing pin 9 this is done by rotating thumb safety 38 around pivot shaft 61 thereby raising sear blocking stud 68 which is integrally attached to thumb safety 38 with the instant invention when sear blocking stud 68 is raised by pivoting thumb safety 38 around pivot shaft 61 the upper end of pin 54 moves under contact with the body of grip safety 14 to a position below sear blocking stud 68 as shown in fig2 and 5 in this position pin 54 prevents thumb safety 38 from rotating downward around pivot shaft 61 to the deactivated position by physical contact of the upper end of pin 54 with sear blocking stud 68 because sear blocking stud 68 is prevented from moving downward out of contact with sear 40 hammer 15 is prevented from falling and discharging the handgun in order to move pin 54 so that sear blocking stud 68 may be rotated downward as thumb safety 38 is deactivated the grip safety 14 must be grasped this causes grip safety 14 and the attached grip safety stop tip 69 to rotate upward around pivot shaft 61 allowing the trigger assembly 49 to be depressed this rotation of grip safety 14 changes the orientation of slot 65 and consequently redirects pin 54 so that pin 54 is moved forward of sear blocking stud 68 as shown in fig3 and 6 when pin 54 is moved free of sear blocking stud 68 thumb safety 38 may be rotated downward around pivot shaft 61 thereby deactivating thumb safety 38 allowing the handgun.