Go watch the video and see the explanation of the circa 2009 ATF letter re: open BCGs and the ensuing differences about bolts between CRs and prior LEs and then get back - differences in hammers, etc. . Also see the part where the forgings on CRs and LEs are discussed...... It's a pretty comprehensive discussion, and from what I see, not tainted by preconceptions and clairvoyant assessments about "behind the scenes disgruntled employee animus' that just isn't there....The most detailed write-up I’ve seen on the CR series, that didn’t include a complete Armorer tear down.
Colt Carbine Model No. CR6920
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