I have a couple of G and V grade Parkers in 16 and 20 gauge that have original butts with inletted DHBP and LOPs of 13-1/2" and 13-5/8". The GH/16 is an 1895 (approx) Damascus, so not an inexpensive gun at the time, but on a 0 frame so who knows? Kids gun? The VH/20 is 1908. Both are 28" with fairly tight chokes. I think they were probably ordered by guys who were just a bit smaller than we are now, or who hunted in very heavy clothing, before the development of modern fabrics and insulation?