I built my own. Cut down a maple...axe and crosscut. Got an axle out of a 1948 ford 3/4 ton pickup rearend, reamed it, built a rifling bench, rifled it 4 groves 1:66. filed on the flats 3/4 octagon, the rest round with 2 wedding rings, Built a bowlathe and turned some hickory ram rods. Cut...