my ques re the 98 3 notch sight was based on my collecting m1's and those who say this rifle is just as it came out of the arsenal. my time in the mech inf when we (squad members ) after a drill would be in a group cleaning our weapons. you hung onto your bolt and bbl'd receiver but all the other small parts minus trigger housings dumped in the solvent bucket cleaned then put back on the weapon. ( one or two anal ones didn't want to mix with the unwashed ).  after a weekend humping the thing just wanted it done ...........Bob   ;)