I like the Pacific K1 sight.  It is compact and light.  When you remove the 'coin-slotted' side lock screw, the slide can be pulled off the base (to clear the way for bolt removal).  The slide is easily returned to its sighted in position.  The elevation set-screw shaft is smooth and not threaded into the sight base.  The K2 target version is a hassle to remove from its base, since it threads into the base.  Both Pacific sights, (as manufactured), require notching the stock to have a full range of adjustment.  I would not use these sights on an unspoiled Krag stock.  The way the Pacific sights fill the magazine cut-off opening is a definite plus.

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