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

26 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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Standard Shipping Estimated Delivery
Estimated delivery: Oct 30
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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
26 Reviews
5 Stars
96%
4 Stars
0%
3 Stars
0%
2 Stars
0%
1 Stars
4%
Reviews Summary
Overall, customers are thrilled with the MK18 RIII upper receiver, highlighting its quality, value, and fast shipping. A minor concern was raised regarding quality control, but positive experiences significantly outweigh this issue, showcasing strong customer satisfaction.
What Reviewers Are Saying
Product Quality
73%
Many reviewers praise the MK18 upper for its robust construction and excellent fit and finish. They express confidence in its performance, with several stating it meets their expectations seamlessly, especially after thorough inspections.
Shipping Experience
55%
Numerous customers note the impressively fast shipping, often arriving much quicker than anticipated. Reviewers appreciate the reliable delivery service, contributing positively to their overall purchasing experience.
Customer Service
27%
A handful of reviewers mention interactions with customer service, specifically highlighting Brownells' responsiveness and helpfulness. These experiences contributed positively to mitigating any issues with the product, like quality control concerns.
Value for Money
41%
Most customers feel they received excellent value for the price, often mentioning great deals and discounts they benefited from. Reviewers consistently express satisfaction with what they received in relation to the cost.
5
Great mid tier upper
This upper offering gives you a lot of flexibility in customizing your rifle while giving you the main/important components like the barrel and handguard and peace of mind that it was assembled correctly by DD. The RIS III handguard is super nice and rigid. I added a microbest chrome BCG, G$ airborne charging handle and a plan B muzzle brake to complete out the upper.
Would you recommend this? Yes, I would recommend to a friend
by KHOI T. on September 28, 2026
Verified Purchase
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5
Nice Quality Upper
Great quality at a vary fair price.
Would you recommend this? Yes, I would recommend to a friend
by CURT W. on September 22, 2026
Verified Purchase
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5
Absolutely love it
Came as promoted and I'm very happy
by Trevor P. on September 22, 2026
Verified Purchase
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5
Mk18 riss3
Best experienced love the product the package was perfect and shipping super fast could not be any happier,also best deal on the internet 👌
by JOSE M. on September 21, 2026
Verified Purchase
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5
DD MK18 Upper
Great deal on a quality upper. Btownells always comes through.
Would you recommend this? Yes, I would recommend to a friend
by Brian C. on September 19, 2026
Verified Purchase
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Customer Questions
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