Sorry for no reply peeps I've been rather busy getting drunk and things, thanks again dave like dave says its a standard fit trigger its an "everlasting hinge" is what they call it but there is not enough flex for it ever to fall out of shape... ever. the amount of flex can be adjusted very slightly by a smaller grub screw inside the front portion of the trigger and the backstop grub actually protrudes both sections but the front section is bored out more with no thread so as to allow for the flex, this long grub screw provides the structural strength for the trigger so if it gets shot it doesnt break.