Man do these small screws seem to turn up missing frequently. Once you lose a couple of them, it becomes a bit uncomfortable trying to shoot your marker while trying to hold the grip on the frame at the same time. You could always use duct tape 'Sticky Fingers' but why when we have them here just a click away? This is a slightly different version than the normal #33C Philips head screws. These have an Allen hex head and come in a convenient 3 pac. All at a slightly lower cost per screw as well when doing the math.
This is a replacement for Kingman part #33C in your manual.
