Raw Lower Blasting

[ar15barrels]

Ah ok. Thanks. I found a type ii anodizer that I think will do finish lower in LA. But it seems that type III is twice as hard as type ii.

Type II is dramatically harder than nothing and still far better than just ceracoat.
Type III is basically the same hardness, but it is much thicker so people think it is harder, but it's just the extra thickness of the hard layer that makes it better.
Functionally, there is no difference between the two on an aR-15 lower.
Type II is around 0.0002" while type III can go over 0.001" which can cause fit issues when you have really tight fitted parts. You need to make a dimensional allowance for type III. You usually do not need Romans a dimensional allowance for type II.

[SweetPotato]

Thank for the simple explanation for this leman. Still looking for FFL anodizer.