I have seen green label R6450's with the sear block (attachment point on the right receiver) beginning around TA0080XX (later attachment points on both sides of the receiver).
Tony
If newer production, be aware that "MU96XX- MU97XX" had a piston defect (chewing up the blue O-ring when attached and removed) and will need to be replaced by KAC.
Tony
Can you PM me the full SN for this?
https://www.hkproshop.com/forums/threads/firearms-reference-data.33/
All information is strictly confidential.
Thanks.
Tony
PM received--- thanks.
Appears to be correct--- factory MP5's that I have seen (1966-1973) were parkerized, while 1974+ were paint over parkerization.
The various paint shades included shiny black (1974-1976), blue-gray (1976-1983), "matte" black (1984-1988), and "deep" NATO black (1989+).
Tony