Winchester 1200 trench gun type of parkerizing

Hello,

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

Thanks

The M1200 receivers were an alloy that couldn't be Parkerized so they were anodized instead (blue/black color).

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?

The barrel and heat shield were the darker Parkerizing on mine .

Yes, the barrel and handguard/bayonet adapter assembly, magazine tube and both sling swivels were Parkerized. As with all Parkerized weapons, shade of the finish could vary. The M1200 trench gun were typically medium to dark gray Parkerizing.

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