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Daily Deal: Brownells Lower Parts Kit For Glock 19/17 $36.52  $29.99- Get Yours! 

BRN XM177E2 Upper Receiver, 11.5", 1-7 Twist, Black
BRN XM177E2 Upper Receiver, 11.5", 1-12 Twist, Black
BRN XM177E2 Upper Receiver, 11.5", 1-12 Twist, Black
BRN XM177E2 Upper Receiver, 11.5", 1-12 Twist, Black
BRN XM177E2 Upper Receiver, 11.5", 1-12 Twist, Black
BRN XM177E2 Upper Receiver, 11.5", 1-12 Twist, Black
BRN XM177E2 Upper Receiver, 11.5", 1-12 Twist, Black
BRN XM177E2 Upper Receiver, 11.5", 1-12 Twist, Black
BRN XM177E2 Upper Receiver, 11.5", 1-12 Twist, Black
BRN XM177E2 Upper Receiver, 11.5", 1-12 Twist, Black
BRN XM177E2 Upper Receiver, 11.5", 1-7 Twist, Black
BRN XM177E2 Upper Receiver, 11.5", 1-7 Twist, Black
BRN XM177E2 Upper Receiver, 11.5", 1-7 Twist, Black
BRN XM177E2 Upper Receiver, 11.5", 1-7 Twist, Black
BRN XM177E2 Upper Receiver, 11.5", 1-7 Twist, Black
BRN XM177E2 Upper Receiver, 11.5", 1-7 Twist, Black
BRN XM177E2 Upper Receiver, 11.5", 1-7 Twist, Black
BRN XM177E2 Upper Receiver, 11.5", 1-7 Twist, Black
BRN XM177E2 Upper Receiver, 11.5", 1-7 Twist, Black
BRN XM177E2 Upper Receiver, 12.7" 1-7 Twist, Pin/Weld, Black
BRN XM177E2 Upper Receiver, 11.5", 1-7 Twist, Black
BRN XM177E2 Upper Receiver, 11.5", 1-12 Twist, Black
BRN XM177E2 Upper Receiver, 11.5", 1-12 Twist, Black
BRN XM177E2 Upper Receiver, 11.5", 1-12 Twist, Black
BRN XM177E2 Upper Receiver, 11.5", 1-12 Twist, Black
BRN XM177E2 Upper Receiver, 11.5", 1-12 Twist, Black
BRN XM177E2 Upper Receiver, 11.5", 1-12 Twist, Black
BRN XM177E2 Upper Receiver, 11.5", 1-12 Twist, Black
BRN XM177E2 Upper Receiver, 11.5", 1-12 Twist, Black
BRN XM177E2 Upper Receiver, 11.5", 1-12 Twist, Black
BRN XM177E2 Upper Receiver, 11.5", 1-7 Twist, Black
BRN XM177E2 Upper Receiver, 11.5", 1-7 Twist, Black
BRN XM177E2 Upper Receiver, 11.5", 1-7 Twist, Black
BRN XM177E2 Upper Receiver, 11.5", 1-7 Twist, Black
BRN XM177E2 Upper Receiver, 11.5", 1-7 Twist, Black
BRN XM177E2 Upper Receiver, 11.5", 1-7 Twist, Black
BRN XM177E2 Upper Receiver, 11.5", 1-7 Twist, Black
BRN XM177E2 Upper Receiver, 11.5", 1-7 Twist, Black
BRN XM177E2 Upper Receiver, 11.5", 1-7 Twist, Black
BRN XM177E2 Upper Receiver, 12.7" 1-7 Twist, Pin/Weld, Black
None
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BROWNELLS - BRN XM177E2 Upper Receiver, 11.5", 1-7 Twist, Black

7 Reviews
Barrel Length
Model Number
Twist
BRN XM177E2 Upper Receiver, 11.5", 1-7 Twist, Black
Brownells #
430108536
MFR #
BRN-17711-7
UPC
050806001107
$806.59
Coupon Code
Purchase Limit Help

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International purchase information

Specifications
Barrel Length:
11.50
Barrel Contour:
Lightweight
Finish:
Phosphate
Gas Block Diameter:
0.625 Inches
Cartridge:
5.56x45 NATO
Gas System Length:
Carbine
Color:
Black
Hand:
Right
Model Number:
Not Pinned/Welded
Quantity:
1
Muzzle Threads:
1/2"x28
Receiver Style:
Complete
Twist:
1-7
Restriction
Threaded Barrel Restriction:
Yes
View US State Restrictions
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International purchase information

What is the BROWNELLS - BRN XM177E2 Upper Receiver, 11.5", 1-7 Twist, Black?

Based on popular carbine configurations, these XM177E2 Upper Receivers are ready for your next Retro build.

The muzzle of the XM177E2 Upper Receiver, is capped by the classic XM177E2 moderator inspired flash hider, with ports around its radius. This muzzle device is a flash hider, unlike the original XM177 muzzle device, which was technically a suppressor.

The flash hider is attached to a lightweight 11.5 or 12.7 inch barrel. Why 12.7 inch? The 12.7 inch model has its muzzle device pinned and welded in place, allowing the overall length of the barrel to reach the required 16” for a rifle.

Barrels are 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 carbine handguards closely emulate the original CAR handguards. These barrel assemblies do have a tapered slip ring, which is proper on carbines of this type.

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 XM177E2 Complete Upper Receivers:

  • M16A1 upper receiver without shell deflector
  • XM177 flash hider with proper grenade ring
  • 11.5” or 12.7” 5.56x45mm NATO barrel
  • 12.7” configuration features a pinned and welded muzzle device, making it 16”+
  • 1-12 or 1-7 twist & chrome bore & chamber
  • M16A1 ejection port cover
  • Tear drop forward assist
  • A1 rear sight assembly
  • Mag particle and high pressure tested
  • Carbine black polymer handguards with heatshields
  • Manganese phosphate mil-spec bolt carrier group with Carpenter 158 bolt

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

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XM177E2 COMPLETE UPPER RECEIVERS REVIEWS

4.4
7 Reviews
5 Stars
71%
4 Stars
14%
3 Stars
0%
2 Stars
14%
1 Stars
0%
Reviews Summary
Overall, customers are highly satisfied with the XM177E2 complete upper receivers, praising their quality, fit, and attention to detail. Most reviews acknowledge superior craftsmanship compared to competitors. However, a few users noted aesthetic discrepancies, particularly regarding the finish, which deviates from original specifications. Mixed feedback on shipping timelines was also discussed.
What Reviewers Are Saying
Product Quality
80%
Many reviewers commend the overall quality of the XM177E2 complete upper receivers, highlighting excellent fit and finish. Users express satisfaction with the detailed craftsmanship, matching or exceeding their expectations, especially when compared to competitor products.
Finish and Aesthetics
20%
Some customers expressed disappointment in the finish of the product, specifically mentioning that the gloss black finish diverges from the historically accurate flat gray anodized look of original models. This has led to mixed feelings regarding the authenticity of the design.
Customer Service
40%
Reviewers appreciate the attentive customer service, particularly in regard to accommodating shipping delays. Customers felt supported throughout the purchasing process, contributing positively to their overall experience.
Fit with Lower Receivers
60%
A recurring positive mention across reviews is the seamless fit of the upper receiver with standard lower receivers. This reliability in compatibility has garnered positive feedback, reassuring builders about its usability.
Value for Money
50%
Numerous reviews note the product's affordability in relation to its quality, deeming it a great value within the market. Users feel they receive substantial quality for the price, enhancing their purchasing satisfaction.
5
Like the Real Ones
Have cared the real one all over RVN and other places I can say that they are as good as real ones. They look and feel like they are the real thing!
Would you recommend this? Yes, I would recommend to a friend
by Donald Patrick on October 20, 2025
Was this review helpful? 6
5
Terrific customer support
Ordered a 177 upper. Due to travel requirements, I needed to delay shipping. Customer service supported delaying this shipment and a small following shipment I’ve seen complaints about uppers from other vendors not mating properly. This one was a perfect fit with a standard lower. Happy customer here
Would you recommend this? Yes, I would recommend to a friend
by DOUG LYNCH on October 18, 2025
Verified Purchase
Was this review helpful? 1
5
Love it’! It’ll make a perfect retro build.
100% top quality. Fit and finish are excellent. Great attention to detail while staying on the right side of the NFA.
Would you recommend this? Yes, I would recommend to a friend
by TIMOTHY BURNS on July 19, 2025
Verified Purchase
Was this review helpful? 3
5
Great product!
It is a quality build! I will have it on the table at this weekend's Gun show!
Would you recommend this? Yes, I would recommend to a friend
by RANDALL COSBY on August 22, 2024
Verified Purchase
Was this review helpful? 8
5
Prototypical appearance with updated performance
I prefer Brownells’ XM177E2 over Palmetto/H&R version. Brownells quality is superior in my opinion from coating, performance and hardware.
by Mark Marquez on August 15, 2024
Verified Purchase
Was this review helpful? 15
View All 7 Reviews
Customer Questions
0 Questions