I don't know.But don't let people mislead you on chromoly.Chromoly is steel,mild steel is steel.Steel wieghs what steel weighs.The only reason Cm is lighter is it is stronger and you can reduce wall thickness.The people at S&W told me the wieght difference between Cm and MS on a 10 point cage is only about 30 lbs.Not enuff for me tos spend another $300.Just my .02c.Plus it has to be TIG welded. :? Pain in the......