I just so happened to watch this vid last night.
Watch this and read the comments.
Lighter springs reduce the muzzle flip to a point but you don't want to go too soft or you will be getting closer to having the gun beat itself up.
Just ordered one of these last week and waiting for it to get to my ffl. Going to be sticking a Thunderbeast fly 9 on it once it gets made and a 6moa dot.
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