Quote Originally Posted by Mark75H View Post
.060" different
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Figure it again. the Mk 30 has a bore of about 2.1094 (2 & 7/64" . The 40" block has a bore of 2 &7/16". (2.4375")
My last calculation was a DIFFERENCE of .328 of an inch bore. Half of THAT is .164".
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Happy sleeving !