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FN America
Overview
The FN America Front Sight Base is a clamp-on gas block designed to fit a gas block diameter of .625 inches, making it a reliable choice for builders looking to achieve optimal gas flow in their AR-15 builds. Constructed from stainless steel, this gas block offers durability and resistance to corrosion, ensuring long-lasting performance under various conditions. This component is commonly found in mid-length gas system builds chambered in 5.56 NATO, providing a solid foundation for accurate shooting and reliable cycling.
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Based on build data
Wmd Guns Ar-15 Gas Tube Nitromet Mid-Length
Gas Tube
Battle Arms Development Rack Ambidextrous Ar-15 Charging Handle - Mod C
Charging Handle
Radian Forward Assist - 7075 Aluminum - Black
Forward Assist
Spikes Tactical Made in USA Ejection Port Door for AR-15 Style Rifle - SED7002
Dust Cover
Aero Precision Stainless Steel Gas Tube - Mid-Length
Gas Tube
Wilson Combat Ar-15 Billet Upper Receiver
Upper ReceiverAggregated and anonymized data showing how builders use this product
| Product | Category | Times Built Together |
|---|---|---|
| Wmd Guns Ar-15 Gas Tube Nitromet Mid-Length | Gas Tube | 127 |
| Battle Arms Development Rack Ambidextrous Ar-15 Charging Handle - Mod C | Charging Handle | 90 |
| Radian Forward Assist - 7075 Aluminum - Black | Forward Assist | 86 |
| Spikes Tactical Made in USA Ejection Port Door for AR-15 Style Rifle - SED7002 | Dust Cover | 82 |
| Aero Precision Stainless Steel Gas Tube - Mid-Length | Gas Tube | 73 |
| Wilson Combat Ar-15 Billet Upper Receiver | Upper Receiver | 72 |
| Platform | Percentage |
|---|---|
| AR-15 | 87.9% |
| AR-10 | 9.7% |
| AR-9 | 2.3% |
| Caliber | Percentage |
|---|---|
| 5.56 NATO | 66.1% |
| .223 Wylde | 16.1% |
| 300 Blackout | 6.4% |
| .308 Win | 3.9% |
| 6mm ARC | 1.4% |
| .450 Bushmaster | 1.1% |
| 6.5 Grendel | 0.8% |
| .458 SOCOM | 0.8% |
| 7.62x39mm | 0.6% |
| .223 Remington | 0.6% |
| 9mm | 0.5% |
| .350 Legend | 0.3% |
| 7.62x51 NATO | 0.3% |
| .204 Ruger | 0.2% |
| .22 ARC | 0.2% |
| .45 ACP | 0.2% |
| .50 Beowulf | 0.2% |
| 6.5 Creedmoor | 0.2% |
| 6.8 SPC II | 0.2% |
| Gas System | Percentage |
|---|---|
| Mid-Length | 47.3% |
| Carbine | 27.6% |
| Rifle | 15.1% |
| Pistol | 9.1% |
| Intermediate | 0.4% |
| Blowback | 0.4% |
| Proprietary | 0.2% |
Builds in the community that include the Fn America Front Sight Base
| Build | Parts | Total |
|---|---|---|
 | 17 | $1225.59 |
 | 20 | $2005.10 |
 | 13 | $1310.28 |
 | 24 | $2114.39 |
 | 23 | $2297.15 |
 | 11 | $1520.54 |
 | 21 | $1680.06 |
 | 19 | $1012.22 |
2 global ratings
Bought this for a milspec build looking for authentic FN parts. The F height matches a carry handle correctly. Forging marks are clean, taper pin holes lined up with my barrel without any drilling. Heavier than a low profile gas block but thats the look.
FN America F-marked front sight base is authentic FN. Wish the taper pins were included since they typically come with the base. Otherwise its the proper forging with the F height marking. Mounts to a barrel with the correct taper pin dimensions.