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The geometry is mil-spec, but the weight is not. This BCG uses a grade 5 titanium carrier which is significantly lighter weight than steel. You do need an adjustable gas block to use as it is intended. Tune your adjustable gas block so your brass ejects at approximately 4:30 and you will achieve a reduction in felt recoil. Using a heavier buffer instead of using an adjustable gas block simply results in the weight being added back in.
We do not carry any Walker Defense Research bolt carrier groups that are compatible with .308. You can find all of the .308 compatible bolts that we carry by using the link below:
https://www.opticsplanet.com/bolt-carrier-group.html?_iv_gridSize=240&_iv_parent-caliber=dot-308-winchester
The Walker Defense Research Titanium Bolt Carrier Group weighs 7.8oz. The carrier alone weighs 5.7oz.