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1870 Carbine question

Posted by D. Miller on Saturday, 5 November 2016, at 10:50 a.m.

I am again requesting assistance from the trapdoor gurus. I have been fortunate enough too compare two 1870 carbines. One is 5/16" ( about .30") shorter in overall length and barrel length. My first thought was the shorter one has been re-crowned but it appears to be original. In Mr. Frascas book he states the front sights are 3/4" (.750") from the muzzle. The front sight of the longer one is .731" from the muzzle and the shorter is .714". Assuming the front sight of the shorter one has not been relocated (no signs of that) it should be .438" from the muzzle if it was re-crowned and shortened 5/16". Another oddity, though minimal, is that Al states the muzzle diameter should be .789". The longer one has an understandable .785" muzzle diameter but the shorter one's muzzle is .777" in diameter. Mr. Hosmer states that if an 1869 Cadet barrel blank was used and cut to carbine length it should measure .785" in diameter. Could these dimensional differences be normal due to these carbines field trial status and a true dimensional standardization was not achieved until the 1873's were produced? Thanks before hand. Dennis


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