When I brought a k98 stock and varous parts at W&P earlier this year, I was pleased to see the stock had numerous waffenamt markings, most notably the stocks upper and lower bands, recoil lug, and bolt dissasembly disks were all marked with a small eagle and the number 37. Initally I thought this was a year date but as I thought about it that didnt make sense as it is a laminted stock which were introduced late in the war as a cost and materiel saving measure. So I did some investigations on waffenamt's on the stock and all the other bits I had brought.
The number 37 is actually a Heereswaffenamt inspectors code which reveals where the parts were manufactured. So here's a rundown on what I beleive I have discovered so far:
The stock, marked 37 was made at J.P. Sauer-u. Sohn, Gewehrfabrik, Suhl, Thüringen (probably in 1944 as its a laminated)
The butt-plate, marked brg was made at H.W. Schmidt, Metallwarenfabrik, Döbeln, Sachsen between 1940-43
The bolt stop marked 46 was made at Berlin-Suhler-Waffen-u. Fahrzeugwerke / Gustloff Werke in 1939
The bolt shroud marked 50 was made at J. A. Henckels Zwillingswerk, Schneidwarenfabrik u. Stahlwerk, Solingen-Gräfrath in 1942
The fore sight is marked 72 was made at E. Winterhoff & Co., Remscheid in 1940
The rear sight is marked S/89 but so far I cant find any matching codes for this part. 
The trigger guard is very interesting. I got it from a kreigsmarine stall at W&P and it had quite a lot of pitting and corrusion from storage in damp conditions. Its the stamped metal version which were made late war to speed production. These were known to be used on kreigsmarine rifles.
It is marked qnw which is an unknown makers mark. it is also stamped 884. Now, 884 is not listed under any waffenamt codes but.... U-884 IS the serial number of a type IXD/42 U-boat! 
U-884 was launched on May 17, 1944 but was badly damaged on March 30, 1945 by US bombs while still in dockyard hands. So I'm guessing that my trigger guard was actually originally on a Kar98 which was part of U-884's on-board armoury. I think thats a pretty cool bit of history! 
Amazing what a few little letters and numbers can tell you eh! 
“I wanted to come to the Volga at a specific location at a specific city. By chance it carries the name of Stalin himself. So don’t think I marched there for this reason – it could carry another name – but because there is a very important goal... this goal I wanted to take – and you know – we are very modest, we have it already."
Adolf Hitler, November 1942
"Comrades, Red Army men, commanders and political workers, men and women guerrillas! It is on your perseverance, staunchness, fighting skill and readiness to discharge your duty to the country that the defeat of the German-fascist army and the liberation of the Soviet land from the Hitlerite invaders depend! We can and must clear the Soviet land of Hitlerite vermin."
Joseph Stalin, November 1942
Nice info. Are would be very interestng if the guard was from U883, shame you don't have the whole thing! Are you sure the stamp isn't Mub though, not qnw??
Nice info. Are would be very interestng if the guard was from U883, shame you don't have the whole thing! Are you sure the stamp isn't Mub though, not qnw??
Nah, its defintely qnw, its is listed as a known waffenamt but the exact maker is unknown . mub is not a listed waffenamt makers mark.
Excellent full listing of all Heereswaffenamt for all weapons and field gear here :
http://claus.espeholt.dk/mediearkiv/waae.pdf
qnw is listed under WaA 214 for triggerguards and winter triggers for K98k made in Lübeck between 1942-44
“I wanted to come to the Volga at a specific location at a specific city. By chance it carries the name of Stalin himself. So don’t think I marched there for this reason – it could carry another name – but because there is a very important goal... this goal I wanted to take – and you know – we are very modest, we have it already."
Adolf Hitler, November 1942
"Comrades, Red Army men, commanders and political workers, men and women guerrillas! It is on your perseverance, staunchness, fighting skill and readiness to discharge your duty to the country that the defeat of the German-fascist army and the liberation of the Soviet land from the Hitlerite invaders depend! We can and must clear the Soviet land of Hitlerite vermin."
Joseph Stalin, November 1942