I've got a couple of these and know that the Canadians officially fitted them to Patt'14 No.2 and No.2 MkIV .22 trainers to simulate aperture sighted rifles like the P14 and No.4. However, there is a reference in Skennertonicon's The Lee Enfield that they were very popular for Service Rifle and small-bore rifle competitions between the wars. Does this mean that they were used on .303 SMLE's? This would give the user quite an advantage with windage and elevation adjustment and a sight base that was considerably longer but the whole thing is held on by an extended ejection screw - fine for the .22LR but not sure about .303 recoil.
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