There is some mention in The Parker Story about the 12-B and alot on the 12-A shotshells. The 12b seemed somewhat popular early on, but didn't seem to last.
Every 12-B Parker I have seen has been a back action lifter in the early days of production to the early 1870s. Sometimes the 12b will be confused with a 14 gauge. They are close but easy to see the difference when you have both guns together.
I do a shoot Parker chambered in 12b and use a 12 gauge wad and RedDot powder in RMC brass shells I had made from original 12b shells I have. It is nice to take it out on occasion, serial# 029.
The 12b just didn't last and the 12a became what we are familiar with as a 12ga today.
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