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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.
No — it won’t cause abnormal wear.
A titanium bolt carrier group has roughly 1/3 less mass than a standard steel BCG and is intended to be used with an adjustable gas block. Tune the gas so brass ejects around the 4:30 position.
Without tuning, the lighter mass allows the BCG to cycle too quickly and the rifle will behave as if it is over-gassed. Proper tuning brings carrier velocity back to normal operating speed while also reducing recoil impulse.
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.