I have an early Rock Island...1908... and there is a strange slot in the upper handguard....it looks original to the handguard...it is about 1/4" wide and 3/4" long and sits just about 5/8" forward of the rear sight base..... my sight base has been milled flat as my rifle has a cocking piece peep sight.

What would this slot be for ?? any ideas ?

Thanks
Joel
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