Okay, I contacted the oracle, this is what the had to say...
Colt used this vertical line, along with a "+" seen on early lowers (SP1, M1601), as a visual aligning mark used in the manufacturing process.
While keeping in mind that this was all done using 50's era machining processes, the machinist would align the mark in a small viewing area before securing the receiver forging and cutting away.
http://imageevent.com/willyp/firearm...=0&y=0&z=9&l=0
Last edited by MisterWilson; 07-19-10 at 12:00.
The Revolution will not be televised.
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