FailZero M16/M4 BCG, No Hammer, EXO Nickel Boron Coated, Black Finish FZ-M16/4-01-NH-BLACK Fail Zero$158.14
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Fail Zero
The FailZero M16/M4 bolt carrier group is a black nitride coated, mil-spec drop-in replacement for AR-platform rifles. Built ready to install into a standard mil-spec upper receiver, this complete BCG handles the demanding work of cycling rounds downrange—whether you're running suppressed, pushing high round counts, or just want a reliability upgrade that lasts. Black nitride coating throughout the critical surfaces means superior wear and corrosion resistance compared to bare steel or standard parkerizing, so your carrier keeps running clean and hard whether you shoot often or store the rifle for months between range trips.
FailZero's nitride finish is applied via black salt bath process, a proven method for durability in duty and competitive rifles. The full-auto carrier design suits any shooter—semi-auto, piston, or suppressed builds all benefit from the robust geometry and enhanced surface treatment. This version ships without a hammer, so it's a straightforward carrier swap if you're upgrading an existing upper or building a parts kit. A chrome-finished firing pin is included, adding another tough, corrosion-resistant component to the package.
If you run high volumes, rely on your rifle for hunting or sport, or just want a BCG engineered for longevity, the FailZero nitride carrier is a genuine upgrade—not a rebranded commodity part. It'll outlast cheaper carriers and deliver the kind of reliability that lets you focus on marksmanship, not equipment.
| Brand | FailZero |
| Product Type | Complete Bolt Carrier Group |
| Finish | Black Nitride (salt bath process) |
| Carrier Style | Full-Auto |
| Compatibility | Mil-spec M16/M4 upper receivers |
| Hammer | Not included |
| Firing Pin | Chrome-finished, included |
| Model Number | FZ-NITRIDE-01-NH |
Yes, the FailZero M16/M4 BCG is mil-spec and designed to drop into any standard mil-spec upper receiver. No modification or fitting is required.
No, this version is sold without a hammer. The package includes the complete carrier, bolt, and a chrome-finished firing pin. If you need a hammer, it can be sourced separately.
Black salt bath nitride coating significantly improves wear resistance and corrosion protection compared to standard parkerize or bare steel finishes. It helps the carrier resist fouling, extends the life of the BCG, and is proven in duty and high-round-count applications.
Yes. The full-auto carrier design works in any AR platform, including semi-auto only builds. The carrier geometry is suitable for all shooters regardless of receiver type.
Fail Zero
The FailZero M16/M4 bolt carrier group is a black nitride coated, mil-spec drop-in replacement for AR-platform rifles. Built ready to install into a standard mil-spec upper receiver, this complete BCG handles the demanding work of cycling rounds downrange—whether you're running suppressed, pushing high round counts, or just want a reliability upgrade that lasts. Black nitride coating throughout the critical surfaces means superior wear and corrosion resistance compared to bare steel or standard parkerizing, so your carrier keeps running clean and hard whether you shoot often or store the rifle for months between range trips.
FailZero's nitride finish is applied via black salt bath process, a proven method for durability in duty and competitive rifles. The full-auto carrier design suits any shooter—semi-auto, piston, or suppressed builds all benefit from the robust geometry and enhanced surface treatment. This version ships without a hammer, so it's a straightforward carrier swap if you're upgrading an existing upper or building a parts kit. A chrome-finished firing pin is included, adding another tough, corrosion-resistant component to the package.
If you run high volumes, rely on your rifle for hunting or sport, or just want a BCG engineered for longevity, the FailZero nitride carrier is a genuine upgrade—not a rebranded commodity part. It'll outlast cheaper carriers and deliver the kind of reliability that lets you focus on marksmanship, not equipment.
| Brand | FailZero |
| Product Type | Complete Bolt Carrier Group |
| Finish | Black Nitride (salt bath process) |
| Carrier Style | Full-Auto |
| Compatibility | Mil-spec M16/M4 upper receivers |
| Hammer | Not included |
| Firing Pin | Chrome-finished, included |
| Model Number | FZ-NITRIDE-01-NH |
Yes, the FailZero M16/M4 BCG is mil-spec and designed to drop into any standard mil-spec upper receiver. No modification or fitting is required.
No, this version is sold without a hammer. The package includes the complete carrier, bolt, and a chrome-finished firing pin. If you need a hammer, it can be sourced separately.
Black salt bath nitride coating significantly improves wear resistance and corrosion protection compared to standard parkerize or bare steel finishes. It helps the carrier resist fouling, extends the life of the BCG, and is proven in duty and high-round-count applications.
Yes. The full-auto carrier design works in any AR platform, including semi-auto only builds. The carrier geometry is suitable for all shooters regardless of receiver type.