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Awesome, must be manganese phosphate then. thanks for the info y’all

Aside from the receiver though, the rest of the steel parts were parkerized right? Barrel, bayonet lug, magazine tube, etc. do you know which type of parkerizing was used on those steel parts?

Hello,

Does anyone know which type of Parkerizing was used to finish Winchester 1200 trench guns steel parts? Manganese or Zinc Phosphate?

Thanks