M16a1 20'''' Rifle Length Upper W/Colt Ar-15 4x21mm - Brn-16a1 5.56x45 Nato 20'''' Bbl 1-12 Twist Upper W/Colt 4x21mm
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Brownells
Overview
The M16A1 20" Rifle Length Upper from Brownells is a complete upper assembly designed for the AR-15 platform, featuring a 20-inch barrel chambered in 5.56 NATO. With a rifle-length gas system and a 1:12 twist rate, this upper is optimized for stability and accuracy, making it suitable for a variety of ammunition types. This upper commonly appears in builds focused on precision shooting or retro configurations, reflecting the classic design of the M16A1.
Specifications
M16a1 20'''' Rifle Length Upper W/Colt Ar-15 4x21mm - Brn-16a1 5.56x45 Nato 20'''' Bbl 1-12 Twist Upper W/Colt 4x21mm
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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 | 100% |
| Gas System | Percentage |
|---|---|
| Rifle | 100% |
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