Brownells Is using an A1 forging also, It really is really typical awareness that they are making use of forgings established by Nodak Spud. Unsure in which you are having your assumptions from. I have seen great outcomes with electroetching. It does get some exercise to have the depth uniform. https://directoryark.com/listings12971005/the-fact-about-colt-combat-unit-rail-gun-45-that-no-one-is-suggesting