I would imagine so, some small pistols are made of brass. Old, cheap, guns had barrels of cast steel. If I were looking to build a cheap mz pistol from found materials, I would look for a used car axle, they are generally made of 4140, or similar, which is good for smokeless. Most scrap yards will sell you that kind of stuff for weight price. It will have to be annealed to work with a standard high speed drill bit. I met a barrel maker from Canada who made a benchrest schutzen barrel from a piece of re-bar, it shoots superbly. Re-bar is generally made from a mix of metals including old rail road scrap, it is a medium carbon steel.