A fully assembled FailZero M16/M4 BCG with EXO Nickel Boron coating is built to run cleaner, last longer, and require less maintenance than a standard bolt carrier group. This no-hammer configuration drops straight into most mil-spec M16, M4, or AR15 upper receivers—no fitting or gunsmithing required. The EXO coating on the bolt, extractor, carrier, cam pin, carrier key, and firing pin reduces friction and resists corrosion, so your rifle performs consistently whether you're running suppressed, unsuppressed, heavy loads, or anything in between. If you shoot enough to care about downtime and fouling, the low-maintenance nature of a nickel boron BCG pays dividends on the range and in the field.
FailZero's patented nickel boron treatment is applied to all critical contact surfaces, creating permanent dry lubricity that won't wash away or wear off like traditional coatings. You get improved reliability and durability without relying on oil to keep things running. For AR shooters who reload, run suppressed systems, or simply want a BCG that shrugs off heavy use, this is a practical upgrade that eliminates the small frustrations of a conventional carrier.
The no-hammer design sets this apart from standard assemblies and may be preferred depending on your upper receiver configuration. Verify compatibility with your specific upper before ordering, particularly if you've customized the hammer pocket or firing control group.
| Product Name | FailZero M16/M4 BCG, No Hammer, Fully Assembled |
| Model/SKU | 009-FZM16/4-01-NH |
| Caliber Compatibility | .223 Remington / 5.56 NATO |
| Receiver Compatibility | Mil-spec M16, M4, AR15 upper receivers |
| Coating | EXO Nickel Boron (patented) |
| Finish | Nickel |
| Configuration | No Hammer |
| Condition | Fully Assembled |
| Coated Components | Bolt, Extractor, Carrier, Cam Pin, Carrier Key, Firing Pin |
This bolt carrier group is designed for mil-spec M16, M4, and AR15 upper receivers. However, the no-hammer configuration means it may not be compatible with all hammer pocket designs. Verify your upper receiver's compatibility, especially if you've modified the firing control group area.
The BCG arrives fully assembled and ready to drop into your upper receiver. No additional parts or tools are required for installation.
This bolt carrier group is compatible with .223 Remington and 5.56 NATO ammunition.
The EXO Nickel Boron coating provides permanent dry lubricity, which means you'll require significantly less maintenance and oil than a standard BCG. However, routine cleaning is still recommended to remove powder residue and debris for optimal reliability.
Fail Zero
Fail Zero
Fail Zero
