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FailZero
Overview
The FailZero AR-15 Bolt Carrier Group is designed for 5.56 NATO caliber rifles and features a Nickel Boron finish that enhances durability and facilitates easier cleaning. This BCG operates smoothly within your upper receiver, providing reliable cycling and consistent performance in various shooting scenarios. It is commonly found in pistol builds, particularly those utilizing a gas system, and is a solid choice for builders aiming to maximize reliability and ease of maintenance in their setups.
Based on build data

Battle Arms Development Rack Ambidextrous Ar-15 Charging Handle - Mod C
Charging Handle
BLEM PSA AR15 Complete Classic Stealth Lower, Black
Lower Receiver
Wilson Combat Ar-15 Lo-Profile Gas Block .750" Black
Gas Block
Magpul AFG-2 Angled Fore Grip - Black
Foregrip
Wmd Guns Ar-15 Gas Tube Nitromet Mid-Length
Gas Tube
Radian Raptor Charging Handle & Talon Safety Selector Combo - Od Green
Charging HandleAggregated and anonymized data showing how builders use this product
| Product | Category | Times Built Together |
|---|---|---|
| Battle Arms Development Rack Ambidextrous Ar-15 Charging Handle - Mod C | Charging Handle | 221 |
| BLEM PSA AR15 Complete Classic Stealth Lower, Black | Lower Receiver | 155 |
| Wilson Combat Ar-15 Lo-Profile Gas Block .750" Black | Gas Block | 145 |
| Magpul AFG-2 Angled Fore Grip - Black | Foregrip | 142 |
| Wmd Guns Ar-15 Gas Tube Nitromet Mid-Length | Gas Tube | 139 |
| Radian Raptor Charging Handle & Talon Safety Selector Combo - Od Green | Charging Handle | 124 |
| Platform | Percentage |
|---|---|
| AR-15 | 86.1% |
| AR-10 | 11.2% |
| AR-9 | 2.7% |
| Caliber | Percentage |
|---|---|
| 5.56 NATO | 69% |
| .223 Wylde | 11.7% |
| 300 Blackout | 7% |
| .308 Win | 3.8% |
| 9mm | 2% |
| 6mm ARC | 1.2% |
| .450 Bushmaster | 1.1% |
| .458 SOCOM | 0.9% |
| 6.5 Grendel | 0.8% |
| 7.62x39mm | 0.8% |
| .350 Legend | 0.3% |
| .223 Remington | 0.3% |
| 6.8 SPC II | 0.2% |
| 6.5 Creedmoor | 0.2% |
| 7.62x51 NATO | 0.2% |
| .204 Ruger | 0.1% |
| .22 ARC | 0.1% |
| .22 LR | 0.1% |
| .224 Valkyrie | 0.1% |
| .45 ACP | 0.1% |
| Gas System | Percentage |
|---|---|
| Mid-Length | 49.7% |
| Carbine | 24% |
| Rifle | 13.3% |
| Pistol | 11.5% |
| Blowback | 1.1% |
| Proprietary | 0.2% |
| Intermediate | 0.2% |
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