Starting with the US Rifle Musket Model 1861 had peeps in the ladder of the long range rear sight. I cant remember of the US Rifle Musket Model 1855 had them or not. Also the Buffington rear sight on M1884 Rrqpdoor had a peep on it. As did the M1901 (?) variant Krag rear sight.
Founder
Ancient Order of the 1895 Winchester
"Come, shall we go and kill us venison?
And yet it irks me the poor dappled fools,
Being native burghers of this desert city,
Should in their own confines with forked heads
Have their round haunches gored."
WS
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