Ok so I have 4 of these babies. One I know fits a 1917 Enfield Rem Mod 30. Now the other three are slightly different from eachother and I am not sure what they fit. I have a size on box 38, 40, and I believe 20-1. If anyone can point me in the right direction to finding the sie that would be great. Also two of them are missing screws all I know is they are very stinking small and they are an allen head other than that I have no clue.