David,what nation are you from?Please define all iron vs.carbon steel in knifes.I shattered a USAF survival knife in sub zero temp.This was in the 1970's,and I was gifted with a Finnish Puukko. It broke every rule of design,but never broke! I even matched it to a rare Finnish Lahti service pistol.This huge 9mm is the only firearm specifically engineered for cold weather!Are you constructing a sling shot?<br><br>