A general overview of the Colt AR15A4

Something new to me, and apparently, sort of new in general, is the Cage code on the barrel, And it also has a Data Matrix stamp on the lower
The code thing is required by the DOD.
It’s most likely due to the contract with the military, FN and Colt were both awarded a contract together in 2015 to produce M4’s, the Cage Code and Data Matrix, are probably something that is required in the new contract.
Plus it’s just simpler to run them all like that in production.

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