to be 99.9% sure Id say no... But, there could be some odd ball recycled reciever dot used at Steyr so I never say never. But, it would certainly never be build up on an Army contract dot43/44 rifle. All you really need to do is study known originals ..
This is so far from correct. There are plenty of byf43 and bcd43 marked ARMY contract rifles built as double claws, why would you exclude the possibility of dot43? Do you have knowledge nobody else does? Were there no dot rifles in ARMY inventory in 1943? But I see, nobody has reported one to you so they must not exist. It’s entirely possible any manufacture of 98k who had inventory in Army depots in early 1943 could potentially exist as a double claw. There are documents supporting the transfer of ARMY inventory to the SS in 1943……and no mention is made of specific manufacturers.