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Your bolt carrier group does a lot of heavy lifting inside an AR-15, and it's one part where cutting corners will bite you down the road. Phase 5 built this one to mil-spec M16/M4 dimensions, which means it carries that full-diameter section at the rear of the carrier for a little extra mass. That added weight helps smooth out the cycle and keeps things running steady shot after shot. It drops right into any standard AR-15 upper, so it's an easy choice for a fresh build or a straight replacement for a carrier that's seen better days.
The carrier is machined from 8620 steel and chrome-lined on the inside, while the bolt is cut from 9310 steel. Every bolt is HPT/MPI tested, meaning it goes through high pressure testing and magnetic particle inspection to catch any flaws before it ever leaves the shop. The black phosphate finish wrapping the exterior does more than look good in a low profile way, it fights off gas erosion and corrosion while cutting down on friction as the group cycles. Chrome lining inside the carrier gives you the same fouling and corrosion resistance where it counts most.
This is a complete, assembled group that ships ready to go with the cam pin, firing pin, gas key, and bolt already in place. It plays nice with 5.56 NATO, .223 Remington, and 300 AAC Blackout barrels, so it fits the majority of AR-15 setups out there. One thing worth knowing up front: Phase 5 does not stake the gas key screws. Their take is that proper torque paired with a sealed key surface does the real work, and staking mainly keeps screws from backing out rather than sealing anything. If you prefer a staked key, you can always have it done, but plenty of folks run these exactly as they come with no complaints.
Yes, this is a drop-in group that fits any standard AR-15 upper receiver. It's built to mil-spec M16/M4 dimensions and works with 5.56 NATO, .223 Remington, and 300 AAC Blackout barrels. That covers the vast majority of standard AR-15 builds.
No. An M16 cut carrier installed in a standard AR-15 does not change how the rifle functions. The M16 profile simply adds a bit more mass at the rear of the carrier, which many builders like for a smoother, more consistent cycle.
Phase 5 ships this carrier with the gas key torqued and sealed but not staked. Their position is that correct torque and a properly sealed key surface do the real work, while staking mainly keeps screws from backing loose. If you'd rather have it staked, it's a simple job for a gunsmith or a capable builder.
HPT stands for high pressure testing, where the bolt is fired with an overpressure round to prove it can handle the stress. MPI is magnetic particle inspection, which reveals any hidden cracks or flaws in the steel. Together they give you real confidence the bolt will hold up under hard use.
| UPC | 813318020123 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | BCGM16 |
| Color | Black |
| Model | |
| Product Type | Bolt Carrier Group |
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