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BRN16A1® 20" COMPLETE UPPER RECEIVERS
BRN M16A1 Upper Receiver 20" Rifle Length, 1-12 Twist, Black
BRN M16A1 Upper Receiver 20" Rifle Length, 1-12 Twist, Black
BRN M16A1 Upper Receiver 20" Rifle Length, 1-12 Twist, Black
BRN M16A1 Upper Receiver 20" Rifle Length, 1-12 Twist, Black
BRN M16A1 Upper Receiver 20" Rifle Length, 1-12 Twist, Black
BRN M16A1 Upper Receiver 20" Rifle Length, 1-12 Twist, Black
BRN M16A1 Upper Receiver 20" Rifle Length, 1-12 Twist, Black
BRN M16A1 Upper Receiver 20" Rifle Length, 1-12 Twist, Black
BRN16A1® 20" COMPLETE UPPER RECEIVERS
BRN M16A1 Upper Receiver 20" Rifle Length, 1-12 Twist, Black
BRN M16A1 Upper Receiver 20" Rifle Length, 1-12 Twist, Black
BRN M16A1 Upper Receiver 20" Rifle Length, 1-7 Twist, Black
BRN M16A1 Upper Receiver 20" Rifle Length, 1-7 Twist, Black
BRN M16A1 Upper Receiver 20" Rifle Length, 1-7 Twist, Black
BRN M16A1 Upper Receiver 20" Rifle Length, 1-7 Twist, Black
BRN M16A1 Upper Receiver 20" Rifle Length, 1-7 Twist, Black
BRN M16A1 Upper Receiver 20" Rifle Length, 1-7 Twist, Black
BRN M16A1 Upper Receiver 20" Rifle Length, 1-7 Twist, Black
BRN M16A1 Upper Receiver 20" Rifle Length, 1-7 Twist, Black
BRN M16A1 Upper Receiver 20" Rifle Length, 1-7 Twist, Black
BRN M16A1 Upper Receiver 20" Rifle Length, 1-7 Twist, Black
BRN M16A1 Upper Receiver 20" Rifle Length, 1-7 Twist, Black
BRN16A1® 20" COMPLETE UPPER RECEIVERS
BRN M16A1 Upper Receiver 20" Rifle Length, 1-12 Twist, Black
BRN M16A1 Upper Receiver 20" Rifle Length, 1-12 Twist, Black
BRN M16A1 Upper Receiver 20" Rifle Length, 1-12 Twist, Black
BRN M16A1 Upper Receiver 20" Rifle Length, 1-12 Twist, Black
BRN M16A1 Upper Receiver 20" Rifle Length, 1-12 Twist, Black
BRN M16A1 Upper Receiver 20" Rifle Length, 1-12 Twist, Black
BRN M16A1 Upper Receiver 20" Rifle Length, 1-12 Twist, Black
BRN M16A1 Upper Receiver 20" Rifle Length, 1-12 Twist, Black
BRN16A1® 20" COMPLETE UPPER RECEIVERS
BRN M16A1 Upper Receiver 20" Rifle Length, 1-12 Twist, Black
BRN M16A1 Upper Receiver 20" Rifle Length, 1-12 Twist, Black
BRN M16A1 Upper Receiver 20" Rifle Length, 1-7 Twist, Black
BRN M16A1 Upper Receiver 20" Rifle Length, 1-7 Twist, Black
BRN M16A1 Upper Receiver 20" Rifle Length, 1-7 Twist, Black
BRN M16A1 Upper Receiver 20" Rifle Length, 1-7 Twist, Black
BRN M16A1 Upper Receiver 20" Rifle Length, 1-7 Twist, Black
BRN M16A1 Upper Receiver 20" Rifle Length, 1-7 Twist, Black
BRN M16A1 Upper Receiver 20" Rifle Length, 1-7 Twist, Black
BRN M16A1 Upper Receiver 20" Rifle Length, 1-7 Twist, Black
BRN M16A1 Upper Receiver 20" Rifle Length, 1-7 Twist, Black
BRN M16A1 Upper Receiver 20" Rifle Length, 1-7 Twist, Black
BRN M16A1 Upper Receiver 20" Rifle Length, 1-7 Twist, Black
None
MadeInUsa MadeInUsa OFF

BROWNELLS - BRN M16A1 Upper Receiver 20" Rifle Length, 1-12 Twist, Black

11 Reviews
Twist
BRN M16A1 Upper Receiver 20" Rifle Length, 1-12 Twist, Black
Brownells #
430108531
MFR #
BRN-M16A1-12
UPC
050806001053
$849.99
Coupon Code
Purchase Limit Help

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International purchase information

Specifications
Color:
Black
Barrel Contour:
Lightweight
Finish:
Phosphate
Gas Block Diameter:
0.625 Inches
Cartridge:
5.56x45 NATO
Barrel Length:
20.00
Twist:
1-12
Gas System Length:
Rifle
Hand:
Right
Muzzle Threads:
1/2"x28
Quantity:
1
Receiver Style:
Complete
Restriction
Threaded Barrel Restriction:
Yes
View US State Restrictions
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International purchase information

What is the BROWNELLS - BRN M16A1 Upper Receiver 20" Rifle Length, 1-12 Twist, Black?

The BRN-16A1® Complete Upper Receivers are back!


Styled after the issued U.S. M16A1, the BRN-16A1® has distinct features, found on late 1960s M16 rifles.

The muzzle of the BRN16A1®, is capped by the classic A1 flash hider, with ports around its radius, and is retained by a proper split washer. The flash hider is attached to a lightweight 20 inch barrel, found on AR-15 variants through the M16A1.

Available with a 1-12 or 1-7 twist. Select 1-12 if shooting 55gr bullets, and 1-7 if shooting 62gr or heavier. The front sight base is not F-marked, meaning the round, tapered front sight post is properly in line with the carry handle rear sight. The black triangle handguards closely emulate the original M16A1 handguards. A flat slip ring is at the end of the 5.56x45mm NATO barrel assembly.


Mounted to the upper is a proper ejection port cover, with a flat external "bump" (not just an off the shelf A2). The receiver is the proper M16A1 style, with a forward assist but no shell deflector. The rear sight is the standard A1 aperture, that can easily be adjusted with a cartridge or tool. Included bolt carrier group is the proper manganese phosphate mil-spec BCG, with chrome lined interior.



Key features of the BRN-16A1®:

  • M16A1 upper receiver without shell deflector
  • 20" 5.56x45mm NATO barrel with 1-12 or 1-7 twist & chrome bore & chamber
  • M16A1 ejection port cover
  • Tear drop forward assist
  • A1 rear sight assembly
  • A1 black polymer handguards with heatshields
  • Manganese phosphate mil-spec bolt carrier group with 9310 bolt
  • A1 flash hider

See all of our AR15s and AR15 parts here.

Threaded Barrel Restriction: 
Threaded Barrels have restricted shipping to CA.

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BRN16A1® 20" COMPLETE UPPER RECEIVERS REVIEWS

4.6
11 Reviews
5 Stars
73%
4 Stars
18%
3 Stars
9%
2 Stars
0%
1 Stars
0%
Reviews Summary
The BRN16A1® upper receivers receive mixed reviews. Many customers appreciate the quality and aesthetics of the product, noting its attractive design and good fit. However, concerns arise regarding finish quality and a few assembly compatibility issues. Overall, the upper is well-regarded, yet some suggest improvements in quality control.
What Reviewers Are Saying
Product Quality
60%
Many reviews praise the overall build quality and aesthetics of the BRN16A1 upper, highlighting its attractive design and close attention to detail. Customers feel it resembles the classic M16A1, enhancing its appeal to enthusiasts.
Finish Quality
40%
Concerns were raised about the finish of the upper receiver, with some customers noting a rough or gritty texture and visible nicks, which detracted from their overall satisfaction, especially given the price.
Compatibility Issues
30%
Several reviewers encountered minor issues with fitting the upper to certain lower receivers, particularly with the dimensions of the lugs. However, most found these issues easily remedied with basic tools.
Overall Satisfaction
70%
Despite some criticisms, the majority of reviewers expressed overall satisfaction with the BRN16A1 upper. Many indicated they are excited to use it and appreciate its appearance and anticipated performance.
Customer Sentiment
50%
A number of reviewers conveyed gratitude towards Brownells for delivering a product that resonates with their nostalgia and builds, indicating a strong emotional connection to the item.
5
Great Upper
This is a great upper to start the M-16A1 Build
by Roger Mayhugh on February 04, 2026
Verified Purchase
Was this review helpful? 0
5
Yes Yes Yes
My "the rifle I used in basic training" build is finally complete. If this upper isn't perfect, I'm certainly not smart enough to tell you why not. Thank You Brownells!
Would you recommend this? Yes, I would recommend to a friend
by CHRISTOPHER HARRISON on October 10, 2025
Verified Purchase
Was this review helpful? 2
5
Awesome
Seems to be a very quality built upper assembly went over it with a fine tooth comb haven't seen any defects. Haven't had a chance to shoot it yet still waiting to finish my lower assembly as soon as some parts come in . But I really like the looks and the feel of the m16a1 Clone that I am building
Would you recommend this? Yes, I would recommend to a friend
by ROGER FREEZE on January 07, 2025
Verified Purchase
Was this review helpful? 2
5
Retro AR
Great product. Perfect fit and already demonstrates perfect accuracy.
Would you recommend this? Yes, I would recommend to a friend
by Timothy Stratton on November 07, 2024
Verified Purchase
Was this review helpful? 2
5
A1complete upper
Well made A1 complete upper. The small details are clone correct. The color and fit are exactly how it should look. Excellent product from Brownells.
Would you recommend this? Yes, I would recommend to a friend
by JOHN HEARD on November 02, 2024
Verified Purchase
Was this review helpful? 5
View All 11 Reviews
Customer Questions
0 Questions