Going by this information, all 3 of these cylinders are B&P Motor Sales, not Brown-Lipe-Chapin?
Note my M1A1SN 592534, barrel date 8-43 has the 3 on top of the barrel
Operating slide spring hole, bored all the way through, for drainage, started at SN 540,000
Note sideways "1" on bolt lug near "OI"
Is this Worcester taper pin?
Information
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