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FailZero
Overview
The FailZero Bolt Carrier Group is designed specifically for the 9mm caliber, offering a reliable and smooth operation for your AR-9 build. The Nickel Boron finish enhances the durability and ease of cleaning, which is crucial for maintaining optimal performance and reliability in a blowback system. This BCG is commonly found in builds focused on competitive shooting and personal defense due to its dependable cycling and low maintenance requirements.
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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