Go to the harware store and get some 1/4-28tpi button head bolts, buy a couple of nuts also buy them longer than needed. measure the length you need then screw a nut down to that length and cut the access off. Now you will have custom screws for less than a $ apiece. As for the one on the trigger guard any wood screw will do as long as it is the right size just don't over tighten. On my BR gun I don't even use one the guard fits tight enough that the action screw holds it with no movement on the guard.