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MK18 RIII 5.56x45mm 10.3"BBL Stripped Upper W/9.5" Handguard
MK18 RIII 5.56x45mm 10.3"BBL Stripped Upper W/9.5" Handguard
MK18 RIII 5.56x45mm 10.3"BBL Stripped Upper W/9.5" Handguard
MK18 RIII 5.56x45mm 10.3"BBL Stripped Upper W/9.5" Handguard
MK18 RIII 5.56x45mm 10.3"BBL Stripped Upper W/9.5" Handguard
MK18 RIII 5.56x45mm 10.3"BBL Stripped Upper W/9.5" Handguard
MK18 RIII 5.56x45mm 10.3"BBL Stripped Upper W/9.5" Handguard
MK18 RIII 5.56x45mm 10.3"BBL Stripped Upper W/9.5" Handguard
MK18 RIII 5.56x45mm 10.3"BBL Stripped Upper W/9.5" Handguard
MK18 RIII 5.56x45mm 10.3"BBL Stripped Upper W/9.5" Handguard
MK18 RIII 5.56x45mm 10.3"BBL Stripped Upper W/9.5" Handguard
MK18 RIII 5.56x45mm 10.3"BBL Stripped Upper W/9.5" Handguard
MK18 RIII 5.56x45mm 10.3"BBL Stripped Upper W/9.5" Handguard
MK18 RIII 5.56x45mm 10.3"BBL Stripped Upper W/9.5" Handguard
MK18 RIII 5.56x45mm 10.3"BBL Stripped Upper W/9.5" Handguard
MK18 RIII 5.56x45mm 10.3"BBL Stripped Upper W/9.5" Handguard
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DANIEL DEFENSE - MK18 RIII 5.56x45mm 10.3"BBL Stripped Upper W/9.5" Handguard

21 Reviews
MK18 RIII 5.56x45mm 10.3"BBL Stripped Upper W/9.5" Handguard
Brownells #
430106317
MFR #
BROWNELLS-MK18 RIII
UPC
818773023795
$899.99
Coupon Code
Purchase Limit Help

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International purchase information

Specifications
Barrel Contour:
Government
Finish:
Anodized
Barrel Length:
10.30
Item Length (Inches):
17.500
Cartridge:
5.56x45 NATO
Color:
DDC
Quantity:
1
Material:
Aluminum
Gas System Length:
Carbine
Twist:
1-7
Item Weight (lbs):
5.000
Hand:
Right
Item Width (Inches):
2.250
Item Height (Inches):
2.250
Make Model Fit:
AR-15.Universal
Muzzle Threads:
1/2"x28
Receiver Style:
Stripped
Restriction
Threaded Barrel Restriction:
Yes
Ship to all EXCEPT:
Australia, Poland
View US State Restrictions
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International purchase information

What is the DANIEL DEFENSE - MK18 RIII 5.56x45mm 10.3"BBL Stripped Upper W/9.5" Handguard?
Adding to their extremely successful line of stripped MK18 Daniel Defense uppers, Daniel Defense now has the stripped MK18 upper with their RIII rail! The MK18 RIII™ AR15 style Upper Receiver Group is unmatched in size, weight, and performance, and is built around a 10.3 inch Cold Hammer Forged M4 Profile barrel and a carbine length gas system. It features a 9.5 inch lightweight RIS III rail—modeled after the revolutionary RIS II two-piece handguard developed for SOCOM— which features M-LOK attachment for lighter weight.


  • UPPER RECEIVER: Mil-Spec with Indexing Marks and M4 Feed Ramps. CNC Machined of 7075-T6 Aluminum, Type III Hard Coat Anodized
  • BARREL: Chrome Moly Vanadium Steel, Cold Hammer Forged, 1:7 Twist, 10.3" Government Profile, Chrome Lined, Mil-Spec Heavy Phosphate Coated, and HP/MPI Tested
  • GAS SYSTEM: Pinned Low Profile Gas Block CNC Machined of 4140 hardened steel with Mil-Spec Heavy Phosphate Coating, Carbine Length, Direct Impingement
  • HANDGUARD: Daniel Defense RIS III 9.5, Patented, 6-Bolt Bolt-Up System, CNC Machined of 6061-T6 Aluminum

Made in the USA!

DOES NOT INCLUDE: Bolt Carrier Group, Charging Handle and Muzzle Device

See all of our AR15s and AR15 parts here.

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

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MK18 RIII 5.56X45MM STRIPPED UPPER RECEIVER REVIEWS

4.8
21 Reviews
5 Stars
95%
4 Stars
0%
3 Stars
0%
2 Stars
0%
1 Stars
5%
Reviews Summary
Overall, customers are thrilled with the MK18 RIII upper receiver from Daniel Defense, praising its quality and the fast shipping from Brownells. Many appreciate its performance in tactical settings. However, some reviewers did highlight issues with quality control, specifically regarding scratches and fit, though customer service from Brownells received commendations for addressing concerns promptly.
What Reviewers Are Saying
Product Quality
80%
The quality of the MK18 RIII upper receiver is frequently praised, with many customers expressing satisfaction with its performance and build. Daniel Defense is recognized for manufacturing reliable and high-quality products, instilling confidence in buyers.
Shipping Experience
75%
Multiple reviews commend the fast and efficient shipping provided by Brownells. Customers have noted quick delivery times, sometimes even receiving their orders sooner than expected, which enhances overall satisfaction.
Customer Service
30%
Customer service experiences are largely positive, with reviewers appreciating the responsiveness of Brownells when handling issues related to quality. The efficiency in processing returns or replacements contributes to overall customer contentment.
Quality Control Issues
20%
Some customers reported quality control problems, such as scratches on the handguard and fit issues with the upper receiver. While these issues were not widespread, they highlight an area for improvement within the manufacturing process.
Value for Money
50%
Many reviewers mentioned the competitive pricing of the MK18 RIII upper receiver, suggesting that it provides excellent value relative to its quality and performance, especially when purchased during sales.
5
It's a MK18!
Beautiful upper, feels robust and out of the box clean. I have not completed my MK18 upper but I've done a thorough visual inspection and it's really built well. I'll know down the road how it works on the range but as for now, this was a great purchase. My only smack-on-the-back-of-my-head is that I purchased it on Father's Day Sale, and the 4th of July just came in and it brings a deeper discount. That's on me! Haha
Would you recommend this? Yes, I would recommend to a friend
by Bahn from FL on June 27, 2026
Verified Purchase
Was this review helpful? 0
5
Awesome
Always wanted one!!
by David Pipkin on May 26, 2026
Verified Purchase
Was this review helpful? 2
5
Love it
Great price for great quality. I love it
Would you recommend this? Yes, I would recommend to a friend
by JAMES KAHAEL on April 15, 2026
Verified Purchase
Was this review helpful? 1
5
Great product
Awesome product
Would you recommend this? Yes, I would recommend to a friend
by CAMERON HAM on April 10, 2026
Verified Purchase
Was this review helpful? 0
5
Outstanding!!!!!!!!!
Great quality upper!! Daniel defense never disappoints!! well definitely get the 14.5! Thanks for the fast shipping!
Would you recommend this? Yes, I would recommend to a friend
by Jayson Bolton on February 27, 2026
Verified Purchase
Was this review helpful? 0
View All 21 Reviews
Customer Questions
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