The lower is the registered part of the XCR, is it not?
In the end, it all comes down to where the manufacturer puts the serial number. The ACR was designed to use a single upper with numerous lowers so the upper was made the serialized portion.
In the end, it all comes down to where the manufacturer puts the serial number. The ACR was designed to use a single upper with numerous lowers so the upper was made the serialized portion.


















































