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Old January 29, 2013, 10:16 AM   #12
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Join Date: November 2, 2007
Location: Northern Orygun
Posts: 4,923
Some No.4 rifles have a tiny shim to take up any side play of the rear sight, if this is missing the sight may move a hair to either side.
The Mark3 and Mark4 backsight has a "collar", .120 thick and .250 diameter, these are the only two backsights that use a spacer of any kind on the axis pin.

The Brit military played up the wandering zero, they did not want to be stuck with a bolt rifle while the rest of the world moved on to semi and full auto battle rifles.
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