I have a M629-4 that has the standard black "patridge-style" front blade sight (6 1/2" barrel). I'm wanting to replace it with the black blade with the brass/gold bead (like on the 625 JM). Who sells these, is it pretty "idiot proof" to install by just pushing out the little sight pin, removing and re-installing the new blade? Comments, suggestions appreciated... TW

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TMW
ExFed

SDM makes them. New sight needs drilling.