New to building with lots of questions.

[spectra]

I am going to try this one https://www.rubbercityarmory.com/scripts...product=49 I want to try the adjustable gas key instead of the gas block. I have all sorts in other builds and all seem to work the same for me. I do have a high dollar NIB one in a suppressed rifle and it does clean up real easy but not worth it to me in the Grendel.