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I swear by Heavybuffers especially in my MWS. I run it in a 556 as well and think it runs a lot smoother. Well worth the price as they're not all that expensive but worth the price for sure. Plus the knowledge and help with any questions Heavybuffers will tell you what weight to get for your rig.
MGI makes adjustable "Regulated Gas Tubes" for AR15/M16 rifles. I don't know if they will work on a .308 rifle. It might be a easy semi-cheap way of deciding if you want to go through the effort of changing to an adjustable gas block. I don't know if anybody else make them.
https://www.mgi-military.com/store/i...hp?category=17