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mrerick · 06-12-2013, 11:13 AM

You've got what is most likely a DWM or Erfurt receiver and barrel with a Mauser made toggle train.

I can't make out the full date of the receiver in your picture. I can read "191" but not the last digit.

The proofs will tell which factory made the receiver and barrel.

The "42" is a concealment code used by Mauser in about 1940.

Since the toggle train and receiver were not manufactured together, you may need to pay attention to the headspace and fit. It's possible that this was done when they were originally combined.

In order to use this 9mm upper with your .30 Luger Alphabet Commercial DWM frame, you'll probably have to replace the recoil spring to handle the larger recoil power of the 9mm and possibly do some trigger system fitting.

I would not alter the DWM's side plate or trigger bar. If you find that the trigger of the assembled combination doesn't work, I would obtain an additional trigger plate, trigger and transfer bar. Don't do anything to alter the parts and operation of the original Alphabet Commercial DWM.

Marc

06-12-2013, 11:13 AM	#2
mrerick Super Moderator - Patron LugerForum Life Patron Join Date: Dec 2009 Location: Eastern North Carolina, USA Posts: 3,925 Thanks: 1,377 Thanked 3,139 Times in 1,520 Posts	You've got what is most likely a DWM or Erfurt receiver and barrel with a Mauser made toggle train. I can't make out the full date of the receiver in your picture. I can read "191" but not the last digit. The proofs will tell which factory made the receiver and barrel. The "42" is a concealment code used by Mauser in about 1940. Since the toggle train and receiver were not manufactured together, you may need to pay attention to the headspace and fit. It's possible that this was done when they were originally combined. In order to use this 9mm upper with your .30 Luger Alphabet Commercial DWM frame, you'll probably have to replace the recoil spring to handle the larger recoil power of the 9mm and possibly do some trigger system fitting. I would not alter the DWM's side plate or trigger bar. If you find that the trigger of the assembled combination doesn't work, I would obtain an additional trigger plate, trigger and transfer bar. Don't do anything to alter the parts and operation of the original Alphabet Commercial DWM. Marc __________________ Igitur si vis pacem, para bellum - - Therefore if you want peace, prepare for war.