and fit into holes in the other plate e g side 1 but fixed pins have previously been laid out so as to fit the trigger trigger guard gun profile of only a single firearm alternatively biased spring loaded pins or movable pins that can be set for a particular firearm configuration are not unusual our invention is novel and nonobvious in its use of fixed pin locks that are designed configured and adapted to fit a plurality of firearms from a particular manufacturer this is enabled as part of the method of our invention as described in more detail below in the method of our invention we take lateral profiles of regions of a plurality of firearms produced by a single manufacturer such as e g shotguns like shotgun 70 adjacent and around their trigger guards 30 i e the same general area covered by the trigger lock of this invention as illustrated in fig7 through 9 these profiles can then be overlaid manually or preferably by using computer assisted techniques and otherwise compared so as to determine the placement of features transverse to the trigger guards 30 that will serve to prevent front to back and up and down movement relative to the trigger guards 30 and or rotational movement of the lock relative to ratchet post assembly 80 and or the trigger guards 30 likewise a plurality of cross sectional profiles of the firearms i e profiles transverse to the barrel axis of the firearms are taken in the areas to be covered by the trigger lock of this invention these can also be overlaid and or otherwise compared to determine how to snugly fit the sides of the trigger lock against the sides of the firearms and their triggers to eliminate side to side i e.