Brn-4 Piston Upper Receiver Kits - Brn-4 14.5'''' Upper Receiver Kit W/ Medium Profile Barrel
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Brownells
Overview
The Brn-4 Piston Upper Receiver Kit from Brownells is a complete assembly designed for AR-15 platforms, featuring a 14.5-inch barrel that balances maneuverability and accuracy. This upper receiver kit allows builders to easily convert their standard direct impingement system to a piston-driven design, enhancing reliability and reducing carbon buildup in the action. This upper is commonly used in builds aimed at tactical applications or short-barreled configurations.
Specifications
Brn-4 Piston Upper Receiver Kits - Brn-4 14.5'''' Upper Receiver Kit W/ Medium Profile Barrel
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Frequently Built With
Based on build data
BLEM PSA AR15 Complete Classic Stealth Lower, Black
Lower Receiver
Battle Arms Development Rack Ambidextrous Ar-15 Charging Handle - Mod C
Charging Handle
Aero Precision M4e1 Complete Lower Receiver W/moe Sl Grip & Sl-S Carbine Stock
Lower Receiver
Magpul AFG-2 Angled Fore Grip - Black
Foregrip
Radian Raptor Charging Handle & Talon Safety Selector Combo - Od Green
Charging Handle
Aero Precision Stripped M4e1 Ar-15 Lower Receiver - Special Edition - Freedom
Lower ReceiverBuild 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 | 360 |
| Battle Arms Development Rack Ambidextrous Ar-15 Charging Handle - Mod C | Charging Handle | 259 |
| Aero Precision M4e1 Complete Lower Receiver W/moe Sl Grip & Sl-S Carbine Stock | Lower Receiver | 230 |
| Magpul AFG-2 Angled Fore Grip - Black | Foregrip | 166 |
| Radian Raptor Charging Handle & Talon Safety Selector Combo - Od Green | Charging Handle | 160 |
| Aero Precision Stripped M4e1 Ar-15 Lower Receiver - Special Edition - Freedom | Lower Receiver | 142 |
| Platform | Percentage |
|---|---|
| AR-15 | 100% |
| Caliber | Percentage |
|---|---|
| 5.56 NATO | 71.4% |
| .223 Wylde | 9.7% |
| 300 Blackout | 6.8% |
| .308 Win | 3.5% |
| 9mm | 2.2% |
| 6mm ARC | 1.1% |
| .450 Bushmaster | 1.1% |
| 7.62x39mm | 0.8% |
| 6.5 Grendel | 0.8% |
| .458 SOCOM | 0.6% |
| .350 Legend | 0.3% |
| 6.5 Creedmoor | 0.3% |
| .45 ACP | 0.2% |
| .50 Beowulf | 0.2% |
| .223 Remington | 0.2% |
| 5.7x28mm | 0.1% |
| .22 LR | 0.1% |
| 7.62x51 NATO | 0.1% |
| 6.8 SPC II | 0.1% |
| .204 Ruger | 0.1% |
| .224 Valkyrie | 0.1% |
| .17 HMR | 0% |
| .22 ARC | 0% |
| 8.6 Blackout | 0% |
| Gas System | Percentage |
|---|---|
| Mid-Length | 50.2% |
| Carbine | 24.5% |
| Rifle | 12.6% |
| Pistol | 11.2% |
| Blowback | 1.2% |
| Intermediate | 0.2% |
| Proprietary | 0.1% |
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