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Posted: 10/11/2005 2:52:22 AM EDT
I'm planning a build on an 80% lower, and I've read the threads
on finishing. How do I get a Manganese Phosphate finish, and what
about finishing before completing the milling? Then the lower would still
not be a firearm? Also, throw in some other ideas on finishes so I can
pick the best one for me.
Link Posted: 10/11/2005 3:39:02 AM EDT
As finishing a 80% receiver is not exactly as easy as it sounds, requiring extensive machining skills as well as hundreds of dollars in tools, bits, taps and equipment (drill press etc....), many have ruined several before getting it done right.

If I were you, I'd put off worrying about the finish, AFTER ya get the 80% lower completed, not before.

Link Posted: 10/11/2005 5:47:06 AM EDT
[Last Edit: 10/11/2005 5:51:20 AM EDT by neilfj]
First, phosphating, bluing, parkerizing, etc. don't work on aluminum, only steel. Unless your lower is made of steel, your options are limited to anodizing or painting (including Norrell's Moly and Duracoat). Anodizing is the best finish but there are plenty of threads here discussing the pro/cons of Moly vs Duracoat, which are arguably the best of the painting options if you go that route.

Finishing before milling is foolish. Milling is going to remove the finish you just applied and you'll have to apply it again, so why do it twice.
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