MP5 parts date code help

[Elkaholic]

I'm sure Tony will help I've looked threw the reference section. I do believe this is all 1993 but not sure.

 

[AGG]

Both are 1993--- I have seen the "normal" date codes on bolt heads.

Tony

 

[Elkaholic]

Any idea why the barrel and bolt carrier are marked IR and not JD?

 

[AGG]

Any idea why the barrel and bolt carrier are marked IR and not JD?

Not certain why different date code systems were used in certain ways--- the "unusual" date code system was used from 1993-2001.
The normal date code system has always been used for receivers and slides--- the other for certain parts and magazines (but not on all LE magazines).

Tony