Our Spring Sale Starts Now - Save 15% On $200+ Orders w/ Code: SPRING15 - SHOP NOW!

Our Spring Sale Starts Now - Save 15% On $200+ Orders w/ Code: SPRING15 - SHOP NOW!

1 / 9

Barrel Length

14.50
11.50
10.30

Brownells #

MFR #

UPC

$1,273.99 - $1,349.99

Select Items In Stock

Add to existing list

Or create new one:

List name

Description

Made In The U.S.A.

Products marked with the Stars and Stripes are proudly made in the U.S.A.

Many customers have asked us to show which products are made in America, and we’ve begun working with our vendors to identify them. This information, however, is not available for all items nor does it imply that foreign merchandise is of lesser quality. We will continue to gather this information to assist our customers in making informed buying decisions, and will keep our website current with the latest information.

Guaranteed. Forever.®

We make purchasing and returning products as simple as possible. If you buy a product from Brownells and decide you don’t need it, don’t want it, or just don’t like it, we’ll take it back any time… with a few exceptions

Exceptions include:

Firearms
Ammunition
Modified 80% frames & receivers
Gun powder
Primers
Liquids
Limited Quantity/Hazardous items
Products that are subject to pending or implemented restrictions due to Federal, State, or Local regulation/legislation

All other products are Guaranteed. Forever.® you can easily identify these products by the Guaranteed. Forever.® Icon.

Guaranteed. Forever.

Guaranteed. Forever.® return policy applies to the product’s original owner along with proof of purchase. Any items returned within 45 days of shipment are entitled to a refund. Any items returned after 45 days of shipment will be issued store credit in the form of a Brownells Gift Card. If a Brownells/Sinclair product was purchased through another retailer as a new product we will require proof of purchase to replace or refund. (Refund will be issued as store credit in the form of a Brownells gift card.)

For more than 50 years the famed silhouette of the M16/M4 has only had one major and several minor changes. Barrel lengths and buttstocks have changed, but more or less the evolution of America’s right arm has proceeded apace with each generation of warrior making her their own. In that time, the sight of the M16/M4 in the competent grasp of young Americans has meant hope to countless millions of people around the globe.

With the advent of the USASOC URGI, that quintessentially American silhouette has changed forever. The Geissele Super Modular Rail MK16 handguard, hammer forged barrel, and mid-length gas system work in concert for a package that delivers measurable increases in hit probability. Designed to take the full rigors of the new M855A1 (AB57) ammunition, the USASOC URGI also takes full advantage of its capabilities. Once the USASOC URGI is installed on an existing system, it essentially makes for a brand new weapon. The USASOC URGI is a near-clone of the upper receiver group currently in service with USASOC.

Mil-Spec M4 Upper Receiver Assembly
Geissele Reliability Enhanced Bolt Carrier Group
Geissele Airborne Charging Handle, DDC
Geissele SMR MK16 Handguard in lengths 9.3, 10.5, or 13.5"
Geissele 5.56MM 14.5" Government profile, CHF, Chrome Lined, Mid-Length Gas, Chrome Moly, 1/7 Twist Barrel
Geissele 5.56MM 11.5", Government profile, CHF, Chrome Lined, Carbine Gas, Chrome Moly, 1/7 Twist Barrel
Geissele 5.56MM 10.3", Government profile, CHF, Chrome Lined, Carbine Gas, Chrome Moly, 1/7 Twist Barrel
Geissele Super Gas Block .750 Low-Profile Gas Block, Pinned (Bombproof Installation)
SureFire SF4P 4 Prong Flash Hider, Pinned & Welded
Super 42 Braided Wire Buffer Spring and H1 Buffer Combo INCLUDED!

Available options:

430103890 430103891 430103892

Specifications

Please select from the options above to see detailed specifications.

Restriction

Please select from the options above to see detailed restrictions.

Please select a FFL Dealer

Brownells Featured Dealers
Choosing a Brownells Featured Dealer is the fastest and easiest way to complete your purchase. Brownells Featured Dealers have agreed to perform FFL transfers on guns purchased online from Brownells. We have their necessary FFL information on file and your FFL order will ship directly to them once processed.
Standard Dealers
Standard Dealers have not yet agreed to perform FFL transfers on guns purchased online from Brownells. If you choose a Standard Dealer, you are responsible for contacting that dealer and arranging for the dealer to submit a signed copy of an FFL and to give Brownells permission to ship the gun.
Not Available Dealers
Not Available Dealers are dealers Brownells cannot ship guns to at this time. These dealers either do not meet our requirements for FFL transfers, or prefer to not perform transfers for guns purchased online from Brownells.

0 dealers near undefined

MK16 URG-I COMPLETE UPPER RECEIVERS 5.56MM Reviews

Rating Snapshot

Select a row below to filter reviews

89%

(8)

(0)

11%

(1)

(0)

Overall Rating

4.7

9 Reviews

Review Summary

The MK16 URG-I upper receiver is highly praised for its solid build quality, impressive fit and finish, and superior shooting performance. However, issues with missing components during shipping and poor customer service from some retailers have been points of frustration for buyers. Overall, it delivers great value for the price, with many considering it a top choice among upper receivers.

Review this Product

REVIEWS

9 Reviews

Verified Purchase

Josh

December 30, 2023

More than expected

The fit and finish of this upper is TOP notch.Every piece is quality.Also came with the newer gen QD reinforcements that wasn’t pictured but was hoping it came on it.Some of the fastest shipping as well!

Was This Review Helpful?

Verified Purchase

ROBERT N.

April 24, 2024

Complete AR upper!

This upper is absolutely gorgeous and 💯 percent worth the price.

Was This Review Helpful?

Verified Purchase

VINCENT N.

November 07, 2024

Vincent N

I would buy it again.

MORE DETAILS

Was This Review Helpful?

Verified Purchase

HEATH B.

August 04, 2024

Solid upper

It’s a little on the heavy side, but it feels so solid and the foregrip is so well made.Great shooter, much better than my DD m4a1.

Was This Review Helpful?

Verified Purchase

Its.Millar.Time

March 02, 2025

Solid Upper!

Picked up an 11.5” URG-I and love it.Super solid upper.Snagged an RC2 to run with it.Very impressed with this setup.Has me curious about the other length offerings or even a Super Duty upper.

MORE DETAILS

Was This Review Helpful?

View all 9 Reviews

Customer Questions

10 Questions

JRGlobal

April 06, 2025

Is the 11.5 inch pinned and welded?

Answers (1)

Was This Question Helpful?

Customer CareCompany Answer

April 07, 2025

Only the 14.5" is pinned and welded.

Was This Answer Helpful?

Lukas

November 18, 2024

Do these uppers come with the latest gen reenforced QD sockets?

Answers (1)

Was This Question Helpful?

Kasey FischCompany Answer

December 05, 2024

Yes, they do.

Was This Answer Helpful?

Jay

November 08, 2024

What muzzle device comes on the 10.3? Description says SureFire SF4P 4 Prong Flash Hider, Pinned & Welded but I am assuming thats for the 14.5

Answers (1)

Was This Question Helpful?

Customer CareCompany Answer

November 27, 2024

It would be the same, pinned and welded.

Was This Answer Helpful?

Will

September 12, 2023

Are these the "clone" or "near-clone"? The "S" at the end of the MFR (08-159S) for the 14.5" did not turn up any search results. Is it the same as 08-159?

Answers (1)

Was This Question Helpful?

KenCompany Answer

September 27, 2023

These are the same, near clone.

Was This Answer Helpful?

Kayne

August 26, 2023

Does this upper come with the buffer and spring like it says in the description? Super 42 Braided Wire Buffer Spring and H1 Buffer Combo INCLUDED? Just want tp make sure. Thanks

Answers (1)

Was This Question Helpful?

Kasey FischCompany Answer

September 07, 2023

Yes, it includes Super 42 Braided Wire Buffer Spring and H1 Buffer.

Was This Answer Helpful?

Shane Carlin

April 06, 2023

Is the 4 prong flash hider on the 10.3” upper pinned and welded or is it just on the 14.5?

Answers (1)

Was This Question Helpful?

Customer CareCompany Answer

April 06, 2023

No, only the 14.5" are pinned and welded.

Was This Answer Helpful?

190

Corlt1

April 04, 2023

What is the total lenght of the 14.5" barrel with the pinned and welded flash hider? Does the NFA consider this arraignment as a 16.1" barrel?

Answers (1)

Was This Question Helpful?

Customer CareCompany Answer

April 04, 2023

14.5" barrel that is pinned and welded to give you OAL of 16.1 that is NOT an NFA item it's a rifle upper so you can put a stock on the lower with any issues,

Was This Answer Helpful?

130

Rizaldy Jimenez

April 03, 2023

I’ve just bought AP Lower receiver with SLK stock from you two weeks ago and if I’m going to buy this 11.5 upper receiver, do I need to register this to ATF as an SBR and pay 200$? Thank You

Answers (1)

Was This Question Helpful?

Customer CareCompany Answer

April 04, 2023

If you lower has a stock installed and you mount a upper with a 16.1" barrel of shorter then Yes that is a Short Barreled Rifle. You need an approval letter before installing the upper to the lower.

Disclaimer: The information provided on this website does not, and is not intended to, constitute legal advice; instead, all information, content, and materials available on this site are for general informational purposes only.

Was This Answer Helpful?

Charles DeSantis

April 03, 2023

What is the total length of the 14.5" unit to include the flash suppressor? Are there NFA restrictions on this item? Finally, these uppers are compatible ie, no gunsmith fitting if mated with a quality mil-spec lower?

Answers (1)

Was This Question Helpful?

101

Customer CareCompany Answer

April 04, 2023

The 14.5" barrel has a SureFire SF4P 4 Prong Flash Hider, Pinned & Welded making is a rifle, NON NFA item.

Was This Answer Helpful?

110

SPIKE ROBERSON

April 03, 2023

Does the SF4P Surefire flash hider on this upper allow for attaching Surefire suppressors?

Answers (1)

Was This Question Helpful?

Customer CareCompany Answer

April 04, 2023

YES. Serves as a rock-solid mounting platform for any SureFire SOCOM Fast-Attach suppressor

Was This Answer Helpful?

View Suppressors	View AR-15 Parts
View 1911 Parts	View Parts for Glock
View Parts for Ruger 10/22	View Schematics

View Suppressors	View AR-15 Parts
View 1911 Parts	View Parts for Glock
View Parts for Ruger 10/22	View Schematics

GEISSELE AUTOMATICS LLC MK16 URG-I COMPLETE UPPER RECEIVERS 5.56MM

Add To Favorite

Guaranteed. Forever.®

Brownells Featured Dealers

Standard Dealers

Not Available Dealers

GEISSELE AUTOMATICS LLC MK16 URG-I COMPLETE UPPER RECEIVERS 5.56MM

Add To Favorite

Guaranteed. Forever.®

Pin in Brownells Featured Dealers

Pin in Standard Dealers

Pin in Not Available Dealers

Brownells Featured Dealers

Standard Dealers

Not Available Dealers