I'm fairly confident that the DRGMs began in 1877 with the DRPs, but I can't say the date of the 1st sporting arm with DRGM. Duraluminium, or Dural for short, were a version of the leichtmetallgewehre which were on the average 10 oz less than their steel counterparts. Titan looks to have its origins in the mid 1920s on airguns, sporting arms, etc. and probably used up until WWII. Some of the drilling adverts you've seen seem to indicate some upper rung variety of "total" safety. The Imman. Meffert firm typically didn't heavily adorn their sporting arms and their motto was that they could turn out 3 production versions to 1 adorned one.
Kind Regards,
Raimey
rse
