I have an NF serial number receiver (1991 manufacture) in 45-70. In the original paperwork it stated that I could have that barrel fitted with 44, 357, 223, 30-30, 22 hornet, shotguns, but not the high pressure larger calibers (30-06, 22-250, 308, etc). Since this does not fit into the SB-1 or SB-2 frames available now, what frame do I have?
I have asked the question before, but can't remember the answer.