arm 3 and arm 3 will release hammer 24 which strikes firing pin 23 which in turn strikes cartridge 32 in barrel 21 thus firing the cartridge the casing 1 is provided with a horizontal slot 34 for mounting a safety 6 for movement therein the safety 6 has a boss with a hole therein for receiving a pin 35 press fitted therein a safty spring 7 is inserted in a tube 14 and the safety 6 is then inserted into tube 14 in alignment with slot 34 the safety 6 has a lip on a lower portion for engaging the push button 5 and preventing its actuation the safety 6 is normally biased into engagement with the push button 5 and must be moved forward against the biasing of spring 7 before the push button 5 can be actuated the device shown in fig3 is similar to the device shown in fig1 and 2 but is adapted to guns other than pistols in fig3 the device 10 is mounted in the gun by two screws 30 the arm 3 is mounted between tabs on casing 1 with its pivot point toward the rear end of the casing 1 the arm 3 has a clearance hole therein and is pivotably attached via a pivot pin 9 the pivot pin 9 is press fitted into the tabs on casing 1 the device 10 is assembled by inserting spring 8 in tube 15 sliding arm 3 through vertical slot 33 in bracket 2 inserting the boss on arm 3 into spring 8 and press fitting pivot pin 9 into the tabs in casing 1 the safety 6 is mounted for movement in a horizontal slot 34 in casing 1 and has a lip engaging the underside of push button 5 the safety.