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630 Posts
Discussion Starter · #1 ·
Did Colt date their barrels?
My 11.5 inch XM 177 upper has all the Colt markings and the barrel is marked
C MP CB and I know what that means.
I'm assuming being an M4 flat top upper it was mfg in the 2000's
If they did date them where would I find that mark?
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