in the trigger structure fig1 a trigger structure comprises the actual trigger body 81 and two bias wedges 83 93 to actuate lock pawls 84 as shown in fig1 the latch mechanism resides below the rail 52 on the sleeve module 14 pre set latch 88 resides between the latch mechanism and the rail 52 in operation the latch is usually in its locked position shown in fig1 and 15 a with lock pawls 84 resting within detents in the rail 52 lower wedge 83 provides a mechanical stop to prevent the lock pawls 84 from accidentally being compressed in intermediate stages the front slope of the wedge 83 actually provides an assist to effectively and securely move the lock pawls 84 into their locked position fig1 and 16 a to unlatch the stock fig1 and 17 a trigger body 81 is compressed against trigger spring 92 this motion causes upper wedge 93 to approach a pawl pin 91 that extends from each pawl 84 and push the pin 91 downward compressing pawl springs 90 not shown in fig1 and 17 a and lowering the lock pawls 84 this then allows the stock body to slide transversely along the rail 52 subject to the pre set system it should be noted that the lock pawl pins 91 do not join the lock pawls 84 together the lock pawls 84 operate independently of each other so that failure of one especially in the open position may be compensated by the action.