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The first production of a carbine model of the Trapdoor Springfield was the Model 1870 (excluding 4 prototypes produced in 1868). There was a focus infantry rifles in theTrapdoor program, and just 362 of these carbines were made in 1870. They use the short receiver of the 1870 rifle, a 21 3/4” barrel, a slinger and ring on these in place of sling swivels, and are not serialized. They also use a unique narrow rear sight slider, for no apparent reason.
The 1870 pattern was the last of the .50-70 Trapdoors, to be supplanted in 1873 by the new .45-70 cartridge. The two main improvements of the type were the shorter receiver (the use of sleeved barrels previously made a longer receiver necessary) and an increase in the opening arc of the breech block (to make it less likely to fall shut inadvertently).
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At Forgotten Weapons I think the most interesting guns out there are the most obscure ones. I try to search out experimental and prototype weapons and show you how they work, in addition to more conventional guns that you may not have heard of before. You’re much more likely to find a video on the Cei Rigotti or Webley-Fosbery here than an AR or Glock. So, do you want to learn about something new today? Then stick around!