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If you wish to supply the serial number,I can look up the date of manufacture for you.The serial numbers for the Springfield trapdoor rifles and carbines are in the general domain for people to find.
go to: oldguns.net then on left of screen scroll down to Manufactor dates and click on US Military. Carbine must have serial number to look up................
You find a book with serial number information and look it up. You find a book with serial number information and look it up.
1 - find serial number on weapon 2- find book with serial number data for weapon you have.
You find a published list of serial numbers for the maker.
first you would have to know gun maker: colt, remington, springfield then model or type (rifle, carbine, pistol) then caliber and last, serial number. next, look up forums on internet for that gun maker and go from there............
Look on the frame
Look at the receiver
Look on the butt or the frame.
Look on the barrel and receiver.
look on the muffler
look on the breach, barrel.