Fn America Auto Sear Assembly
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FN America
Overview
The FN America Auto Sear Assembly is a critical component designed for the AR-15 platform, enabling semi-automatic and fully automatic fire modes. This assembly provides a reliable interface for the trigger to engage the sear, essentially controlling the firing mechanism's operation. While primarily utilized in specialized builds, it is often found in configurations aimed at competitive shooting or tactical applications.
Specifications
Available Merchants(1)
Frequently Built With
Based on build data
BLEM PSA AR15 Complete Classic Stealth Lower, Black
Lower Receiver
Aero Precision Stripped M4e1 Ar-15 Lower Receiver - Special Edition - Freedom
Lower Receiver
Battle Arms Development Rack Ambidextrous Ar-15 Charging Handle - Mod C
Charging Handle
Strike Industries Extended Bolt Catch
Bolt Catch
Wilson Combat Ar-15 Lo-Profile Gas Block .750" Black
Gas Block
Wmd Guns Ar-15 Gas Tube Nitromet Mid-Length
Gas TubeBuild Configuration Breakdown
Aggregated and anonymized data showing how builders use this product
PlatformBased on real build data showing which platform (AR-15, AR-10, AR-9) builders pair with this product.
CaliberBased on real build data showing which calibers builders choose alongside this product.
Gas SystemBased on real build data showing which gas system lengths builders use with this product.
| Product | Category | Times Built Together |
|---|---|---|
| BLEM PSA AR15 Complete Classic Stealth Lower, Black | Lower Receiver | 159 |
| Aero Precision Stripped M4e1 Ar-15 Lower Receiver - Special Edition - Freedom | Lower Receiver | 158 |
| Battle Arms Development Rack Ambidextrous Ar-15 Charging Handle - Mod C | Charging Handle | 156 |
| Strike Industries Extended Bolt Catch | Bolt Catch | 136 |
| Wilson Combat Ar-15 Lo-Profile Gas Block .750" Black | Gas Block | 134 |
| Wmd Guns Ar-15 Gas Tube Nitromet Mid-Length | Gas Tube | 125 |
| Platform | Percentage |
|---|---|
| AR-15 | 81.9% |
| AR-10 | 15.1% |
| AR-9 | 3% |
| Caliber | Percentage |
|---|---|
| 5.56 NATO | 68.3% |
| .223 Wylde | 12% |
| 300 Blackout | 7.2% |
| .308 Win | 3.8% |
| 9mm | 2% |
| 7.62x39mm | 1.2% |
| 6mm ARC | 1.2% |
| .450 Bushmaster | 1% |
| 6.5 Grendel | 0.9% |
| .458 SOCOM | 0.5% |
| .223 Remington | 0.4% |
| .350 Legend | 0.3% |
| .224 Valkyrie | 0.2% |
| .45 ACP | 0.2% |
| 7.62x51 NATO | 0.2% |
| 6.5 Creedmoor | 0.2% |
| 6.8 SPC II | 0.2% |
| .204 Ruger | 0.1% |
| .22 ARC | 0.1% |
| .22 LR | 0.1% |
| Gas System | Percentage |
|---|---|
| Mid-Length | 49.1% |
| Carbine | 25.7% |
| Rifle | 13.2% |
| Pistol | 10.7% |
| Blowback | 1% |
| Intermediate | 0.2% |
| Proprietary | 0.1% |
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