BHW coined the term term Type I for .125 and Type II for .136 because they were selling barrels chambered for both bolts. Just recently BHW decided not to offer .136 bolts.
BHW primarily sold .125 but offered a choice of either .125 or .136 for a period of time.
BHW primarily sold .125 but offered a choice of either .125 or .136 for a period of time.

