Mauser went to the z-block in 1937, possibly higher. You should check Vol.I to see what Bruce came up with. This is definitely a q-block with that RR and BC.
Thanks Loewe for the identifying the letter suffix. Sorry for my ignorance, BC=Barrel Code, what is RR? And I definitely need to get these books, they would help me out. Especially Vol. II when it comes out. I'm hoping they cover depot rifles from different districts. I picked one up last weekend from the 20th district. I have it posted over on gunboards in K98 section.
Thanks Lee
Yes, I use RR=right receiver (acceptance) and BC=barrel code, many others that are derived from my trends work (spread sheets logging characteristics of all rifles I come across). It saves typing and most on this forum know the more common ones used, SDP=Steyr-Daimler-Puch, MO=Mauser Oberndorf, MB= Mauser-Berlin etc..