I fitted a later SMLE cut off , that way you can use any mag or just file the piece out like on the SMLE cut off , I have 4 old "Lee Speeds" now Im fixing up , one a LSA & 2 of them engraved & 3 BSA actions too , getting out of hand really !

Im sure a older mag could be found , but cost more & really dont work as well with Spitzers or lighter bullets .