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Re: Carbine Ring Size?

Posted by Pete Nelson on Sunday, 21 November 2010, at 8:15 a.m., in response to Carbine Ring Size?, posted by Bill M. on Sunday, 21 November 2010, at 3:00 a.m.

Good Morning Bill,

In the various CARBINE PRODUCTION CHARTS which Al Frasca has included in his "THE .45-70 SPRINGFIELD, BOOK II (1865-1893", he gives the following nominal size ranges:

THINNER (EARLY PRODUCTION):

Bar: 0.194" stock diameter, Ring: 0.165" stock diameter.

THICKER (LATER PRODUCTION):

Bar: 0.220" stock diameter, Ring: 0.185" stock diameter.

I just last week sent a completely-original later-production bar and ring off to a friend to install on his later-issue carbine after taking a number of wire-size measurements with both a 1-inch electronic micrometer and a 6-inch inside/outside caliper (both good-quality Starrett instruments), but unfortunately I sent the only copy I had made of the measurements off to him with the parts. But as I recall wire diameter used for the ring was closer to 0.190"-0.191" diameter and for the bar about 0.219"-0.221" diameter. And checking the wire diameter at various points around the circumference on both ring and bar I found the normal to-be-expected variations of several thousandths.

Just for my own curiosity I will check one of the two early-production bar and ring sets I have also also some of the thin and thick sets on a few of my early and late production carbines and post the results here.

With best regards,

PETE


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