Bolt Carrier group finishes

[survivalshop]

I just ordered a Black Nitrated  M16 BCG from Shadow op's & I have been wondering about the finishes on these kind of parts .

 

What with all the treatment types out there which type , really is better for a long lasting system . I have a few that are Chrome , & Phosphate & my newest 308 BCG in NIB , but now the Nitrated .  I don't seem to have excess wear on any of them & I have one build that I built in the late seventies , with a phosphate BCG & it has the a little finish worn off , here & there , but still works fine .

 

What happened to Melinite treatment or is that just used on Barrels or is it a form of Nitrated ?

 

I remember the post that had a bunch of different finishes they salt tested ,but since it was from a manufacturer of one of the products , well , I took it as such . 

 

Are these new type treatments any better than Chrome or Phosphate ? They really are quite new, to have any kind of a history .

Edited October 15, 2013 by survivalshop