The FailZero Lightweight Low Mass BCG in EXO Nickel Boron is built for shooters who demand faster follow-up shots and less felt recoil without compromise. At just 9.2 ounces fully assembled, this bolt carrier group strips 21% of the weight from a standard mil-spec design while keeping every critical component coated in FailZero's proprietary EXO Nickel Boron finish. Drop it into any mil-spec AR15, M4, or M16 upper receiver and you'll immediately notice the smoother cycling and reduced mass—advantages that matter whether you're chasing competition times, hunting rough country, or running drills at the range.
The real magic is in the coating. EXO Nickel Boron applied to the bolt, extractor, firing pin, carrier key, and cam pin creates permanent dry lubricity, meaning your rifle runs cleaner and cycles smoother with less fouling buildup. You'll spend less time scrubbing carbon and more time shooting. The high-polish finish on all components isn't just eye candy; it contributes to the overall reduction in friction that makes follow-up shots snappier and easier to control. This BCG is compatible with 5.56, .223, and 300 Blackout—covering the most common AR platforms out there.
FailZero backs every BCG with a lifetime guarantee and builds this one without a hammer, making it a tailored fit for specific upper builds. It arrives fully assembled and ready to run, no gunsmithing required. Whether you're lightening your rifle for a long day in the field or shaving milliseconds off your stage times, this low-mass carrier delivers the speed and reliability you need.
| Bolt Carrier Weight | 6.4 oz |
| Complete BCG Weight | 9.2 oz |
| Weight Reduction vs. Standard | 21% |
| Coating | EXO Nickel Boron |
| Finish | High-polish Nickel |
| Hammer | No Hammer |
| Compatible Platforms | Mil-spec AR15, M4, M16 uppers |
| Compatible Calibers | 5.56 NATO, .223 Rem, 300 Blackout |
| Coated Components | Bolt, Extractor, Firing Pin, Carrier Key, Cam Pin |
| Condition | Fully assembled, ready to install |
Yes. This is a mil-spec bolt carrier group compatible with any standard mil-spec AR15, M4, or M16 upper receiver. It drops in fully assembled and ready to run.
This BCG is compatible with 5.56 NATO, .223 Remington, and 300 Blackout.
The lightweight carrier weighs 6.4 ounces and the complete assembled BCG is 9.2 ounces—a 21% reduction from standard mil-spec weight. That reduction translates to less recoil and faster follow-up shots.
EXO Nickel Boron provides permanent dry lubricity and extreme durability while resisting corrosion. It reduces friction and fouling buildup, meaning your rifle runs cleaner and requires less frequent deep cleaning compared to standard coatings.
Fail Zero
Fail Zero
