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According to several sources (this from a Dillon Precision PDF document), the first block of M1903A4 serial numbers were 3407088-3427087, so my 3.411M falls into the first block, as does your rifle.

I bought a sporterized M1903A4 almost identical to the one you show in photos, back in 2015, for $400. Found it on Facebook marketplace, before they got ****y about firearms and accessories. The...