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The CK is a Colt Kaiser forge code. LM is Martin Marietta forge code. They are pretty much identical. The LM uppers were made as contract spares for when the Colts wore out, were damaged, or destroyed. Again, the only difference is the Colt markings. I think it is well worth $140 and would make a great upper receiver for an SAK replacement barrel or any other 70s-era weapon you wanted to put it on. But as far as forward-assist A1 uppers, it is a good one. uxb |
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