I am resurrecting this thread due to a WWII Mauser that I saw for sale. I do not know that the bottom metal of this Waffenwerke Brunn wartime Mauser matches the action; however, I think that it likely does. It has the late war type "winter trigger guard". I am not a military collector and have not studied the WWII Mausers. I am a avid commercial Brno collector. Since this military trigger guard looks much like the post war Brno sporter guards in that it has a two piece magazine box, I was curious if anyone knows if this late war modification was started by the Czechs and then used on the postwar Model 21/22 series of rifles? Any information is appreciated. Also note that it lacks the locking screws on the bottom metal.