Thanks guys, u saved me a ton of work. I'm now leaning towards the Centurion c4 cutout rail. Can anyone confirm if this will work on the 6920? I see they also offer gas blocks, what exactly are these for and will I need or want it?
Also looking to add a eotech Xps3, troy BUIS, Magpul grips, and magpul ctr stock.


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