The PC 400 series had the stainless milled handles that started out as 5/8" stock and 3/16" blades. The BM 44,45, and 48 had cast stainless handles about 3/8" thick (just like the new ti handles on the 42,43, and 47) and 1/8" blade stock. Two totally different knives; the PC's were about 4 times more money than the 44, 45, etc...