Re: Barrel plug fell out during parkerizing
How much etching you get is diretly related to the roughness of the blasting.
Let's make the assumption that your barrel was plugged while blasting.
Therefore, the inside should be real smooth and the outside rough.
The park will darken the smooth interior, but it won't make it rough.
When I used to make AR barrels, we always blasted with plugs, then pulled the plugs before park.
As soon as the barrel comes out of the park, the bores got swabbed with oil.
Never had any problems with chromoly barrels fouling any more than a stainless barrel...