So, I have a straight handled bolt, with indentations on underside of lug, punch mark on root of handle underneath it, with what looks like a G J on the bottom of the thrid lug and no NS - early SA - correct?
The SA with dot and L has a swept back bolt, no indentations under lug, no NS. Late SA?
Last is R on root, swept back, not NS marked, no indentations.
Shround is marked R on both I have, so I am betting all guts are Rem.
Would the late SA be best to use or the R? Which is safest I guess is the next question

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Receiver is 851###, made in 1918 and double heat treated from my readings. I found a used 03 semi pistol grip stock in good shape, so just need metal and HG.