Spartan gunsmith adapters brass vs aluminum

[Deli]

I did a quick search and didn’t see anything, but for those that have the spartan gunsmith adapters, is there a functional difference between the classic and the brass? I’d like to install on my x bolt pro to give me better options of shooting off my Davros pro head.
Also, for those that have them, did you install just one in front of the mag and keep the stud mounted one up front or did you install another gunsmith adapter in front (or behind?) the stud as well? Any help would be greatly appreciated before I start messing with my carbon stock.


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