To say that there isn't a lot of info about these bayonets on this very forum beggars belief.............. If I was you I'd take the grips off it, put the screws and nuts back in and send it to Brian at BDLicon and ask him nicely, when he's next doing a big pile of bead blasting, phosphating, painting and baking, would he strip the catch, spring and bolt out of it and put it in with the others together with the scabbard. Then when it returns in a month, Yoiu'll have a virtually brand new No5/SMG bayonet worth a lot of money