Apollo DLC Bolt Carrier Group - C158 HP/MPI

The Alpine Research Apollo DLC Bolt Carrier Group represents the highest standard of process control and component quality available in an AR-15 BCG.

Featuring Diamond-Like Coating on both the bolt and carrier exterior, chrome-lined carrier body, and a Carpenter 158 HP/MPI bolt, the Apollo BCG delivers ultra-low friction, enhanced wear resistance, and the rifle-to-rifle consistency Alpine Research is known for.

Process-Driven Quality

By reading the specifications alone — Diamond-Like Coating, chrome-lined carrier body, Carpenter 158 HP/MPI bolt, Sprinco extractor and ejector springs, OCKS gas key fasteners — you would be left with the impression that this is a premium bolt carrier group. But specs only tell half the story.

Unlike factory-assembled BCGs pulled from parts bins, every component of the Apollo BCG is individually measured and sorted by dimension to carefully manage clearances between mating parts like the bolt and carrier body. This dimensional control is what produces the extreme gas efficiency, consistent cycling behavior, and rifle-to-rifle uniformity that separates Alpine Research from conventional manufacturers.

Factory-built rifles pull BCGs from bins with wide tolerance ranges, which is why two rifles of the same model can feel noticeably different to shoot. By controlling clearances at the component level, Alpine Research eliminates that variation entirely.

Assembly & Validation

Only after this screening and sorting process are components assembled into an Alpine Research bolt carrier group. Gas keys are surfaced flat, sealed, torqued with OCKS fasteners, and mechanically staked to prevent leakage and loosening under sustained high-volume shooting. This is the level of process control that eliminates the rifle-to-rifle variation common in even premium factory builds.

After assembly, every completed bolt carrier group is fire-test validated through live firing to verify proper cycling, extraction, ejection, and lock-back on empty magazine. Only after passing this final validation is a BCG placed into inventory or installed in an Alpine Research rifle.

Why pick the DLC carrier instead of the Classic Enhanced Mag-Phos carrier?

The DLC coating is an extremely low friction coating, reducing the friction resistance present during the cycling operation.  This is a desirable characteristic in certain short dwell designs, such as the Apollo rifle.  The DLC coating makes the carrier very easy to quickly wipe down and re-lubricate during a range session.

If you don't value easy clean-up, and you don't need the ultra low friction coating, skip the DLC and go with our Classic Enhanced C158 HP/MPI carrier instead - the only difference between the two is the exterior coating on the carrier body and bolt.

Why Choose the Apollo DLC BCG?

For Builders Who Demand Consistency

If you're building a rifle where performance matters, the Apollo DLC BCG eliminates the guesswork. Every BCG is measured, sorted, and validated to ensure consistent gas efficiency and predictable cycling behavior — so the rifle you build shoots the way you expect it to.

For Shooters Running High Round Counts

The combination of high quality materials like Carpenter 158, DLC coating on high-friction surfaces, chrome-lined carrier bore, and tightly controlled clearances means the Apollo BCG maintains its performance characteristics over extended use. Less friction equals less wear, and tighter tolerances mean more consistent cycling even as components break in.

For Professionals Who Can't Afford Failure

This is the same BCG used in Apollo Series rifles trusted by SWAT and specialized units. Fire-test validation ensures every carrier leaving our facility has demonstrated proper cycling, extraction, ejection, and lock back before it's sold.