I have two IHC Gap Letter garands and both of them have different elevation pinions. One has Brittish proofs and is 100% and looks like it has been fired very little. The wind. knob is marked IHC DRC the elevation is marked NHC. serial #4641516 barrel LMR 5-53. Next is #4642866 barrel LMR 7-53, old DCM gun. Windage is IHC DRC, elevation is WCE. Neither IHC appears to be messed with. Are the elevation knob markings correct for an IHC? I have another DCM IHC and the elevation is marked IHC and W in a hexigon. Any insight would be great. Any books on IHC garands on the horizon? Also, why does one of my gap letters have british proofs? I thought most of the rifles with british proofs would be WWII.