1919A4 Build Tutorial 7
Remove the receiver from the park thank and immerse it in boiling
water for at least 5 minutes, this will neutralize all the park solution and
get it out of all the nooks and crannies. If you are not doing a post black
treatment remove the receiver and spray with neutralizing / de watering oil.
Let it soak until it cools off.
Immerse the receiver in the black oxide solution for about 5 minutes,
make sure it is completely covered. Remove it from the solution and put it
back in the boiling water bath for about 5 minutes.
Remove it from the water and spray with neutralizing / de watering oil.
Let the oil soak in untill the receiver has cooled off.
Here is the finished receiver ready to be cleaned and assembled. If
you followed the instructions you should have a nice jet black even finish
on all your parts.