AR-10 BCG with a 4140ph carrier and bolt, staked gas key, and DLC on every internal part.

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Next Level Armament NLX .308 AR-10 Complete Bolt Carrier Group Right Hand DLC Dark Grey
The NLX308 Bolt Carrier Group brings Next Level Armament's AR-15 BCG approach to the AR-10. The carrier is machined from 4140ph steel with an expanded rear for smooth cycling in the buffer tube, and the bolt is SAE 4140ph steel, hardened, shot peened, and magnetic particle inspected. The gas key is staked to mil-spec.
Next Level DLC coats the carrier and all internal parts, including the firing pin, cam pin, and extractor. DLC reduces friction and wear and cleans quickly, which matters in a .308 gas system that runs dirtier than a 5.56. This is the right-hand version; the NLX257 is built for left-hand uppers.
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Add the Next Level Armament NLX308 AR-10 DLC Bolt Carrier Group to your build and see how it enhances your platform.