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1903 Unfinished Receiver?
- Thread starter shank0668
- Start date
Missed the nickel steel part....and I'll confess that my knowledge of heat treatments is not as extensive as I'd like it to be.
But I have learned that they were made from Steel grade 40, very similar to 1040 steel here -which is also similar to the 4140 currently used for modern receivers, but lacking chromium and molybendum which would be in short supply in wartime
http://metallicheckiy-portal.ru/marki_metallov/stk/40
I occasionally see write-ups about them being case-hardened like Mausers which absolutely isn't the case.
But I have learned that they were made from Steel grade 40, very similar to 1040 steel here -which is also similar to the 4140 currently used for modern receivers, but lacking chromium and molybendum which would be in short supply in wartime
http://metallicheckiy-portal.ru/marki_metallov/stk/40
I occasionally see write-ups about them being case-hardened like Mausers which absolutely isn't the case.
The letters indicating the steel type (NS = Nickel Steel) were normally removed in finishing the receiver. Their only purpose was to make sure the machine shop knew what they were working with and that it met current specs (not a leftover from old production, for example)..
Jim
Jim
The flat pads on the side of the receiver gave a flat/square surface to fixture on for other machining operations.
Pure speculation on my part,those two grind marks on the top of the forward receiver ring MIGHT be the shop floor way of indelibly marking the part as "Non-Conforming",or reject.
As a part like that moves from machine operation to operation,it will be gauged or checked.
When an operation is set up,,the first part through that operation will be subjected to "first article inspection",typically by a different employee qualified to verify that cut or hole or geometry was done properly.That would be done before that operator ran the whole lot,say 105 parts,through the operation.
We would paint them with red dykem,notch them with a cutoff wheel,attach a non-conformancy tag,and enter a non-conformancy report .
Those two grind marks look like that to me.
Pure speculation on my part,those two grind marks on the top of the forward receiver ring MIGHT be the shop floor way of indelibly marking the part as "Non-Conforming",or reject.
As a part like that moves from machine operation to operation,it will be gauged or checked.
When an operation is set up,,the first part through that operation will be subjected to "first article inspection",typically by a different employee qualified to verify that cut or hole or geometry was done properly.That would be done before that operator ran the whole lot,say 105 parts,through the operation.
We would paint them with red dykem,notch them with a cutoff wheel,attach a non-conformancy tag,and enter a non-conformancy report .
Those two grind marks look like that to me.
Mike Irwin
Staff
Interesting thought on the grind marks. I was wondering about them myself.
I have a friend, collector, resource person and builder of period correct 03s that has 6 receivers that were made between the Crag and the spiked bayonet.
None of them are heat treated and one has the open rear like the Crag, I have a picture with all 6 side by side but I do not have permission to post the picture on the Internet. Most of them he found in Tulsa.
F. Guffey
None of them are heat treated and one has the open rear like the Crag, I have a picture with all 6 side by side but I do not have permission to post the picture on the Internet. Most of them he found in Tulsa.
F. Guffey
Bannerman purchased a quantity of unfinished M1901 receivers - some [.303] were made up from bits n 'pieces and given to Britain by him in WW1. Some were made up into sporting rifles.
These M1901 receivers can be distinguished by the lack of a 'hump' on the charger bridge for the safety lug to pass through; the cutoff housing is also somewhat different.
These M1901 receivers can be distinguished by the lack of a 'hump' on the charger bridge for the safety lug to pass through; the cutoff housing is also somewhat different.