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Questions & Answers
will this upper be compatible with other brands glock 9mm magazine adapters? Manufacturer Answer

Yes, however if you are using our MAG-AD with this upper we recommend factory magazines.

by STERN DEFENSE, Manufacturer, March 26, 2025
is the gas block pinned Manufacturer Answer

This is a direct blowback system. No gas block.

by STERN DEFENSE, Manufacturer, March 26, 2025
Customer Reviews
Helpful Positive Review
The barrel itself is quite heavy and it is noticeable vs a regular 22.3 upper. However with that being said it does need a good cleaning before you take it out to the range as mine had a ton of gunk in the feed ramps and in the barrel. Other then tha...
Read More...
4/4 found this helpful
Helpful Positive Review
Great 9mm Upper by GMan, March 13, 2019
Building a 9mm based AR platform rifle. As usual, I looked to Optics Planet for my parts. Very pleased with this upper, better than advertised. Fit, finish and performance excellent. Would highly recommend this brand. You won’t be disappointed.
1/1 found this helpful
Most Recent Reviews
Excellent kit by Tom, Verified Owner, January 1, 2026
This conversion works. I only have about 70 rounds through it but it functions great. The only thing I added was a Macon Armory dead blow buffer for 9mm.
Most Recent Reviews
Great 9mm upper by Knighthawk, Verified Owner, November 21, 2024
This was a great price a complete 9mm upper. Stern Defense builds a quality company and Optics Planet delivers, at a good price.
Read All 4 Reviews
Caliber:
9mm Luger
Barrel Length:
16.1 in
Muzzle Device:
SCB 9 Comp Break
Finish:
Matte
Color:
Black
Additional Features:
6061 aircraft grade aluminum., Hard-coat anodized, Light weight construction., Smallest inside diameter 1.435 inches., Sturdy Construction.
Condition:
New

Code: 3JS-URC-SD15M-015-SD15INCHMOD4-KK

MPN: 015-SD15INCHMOD4MLOK16.1INCHBARREL9MM-KK

UPC: 860141001553

List: $544.45Save $10.00
$534.45

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OP Bucks$10.69

Product Info for Stern Defense AR-15 16.1 inch Assembled 9mm Upper Receiver w/15 inch MLOK Rail

Stern Defense 15 inch KEYMOD rail (Barrel nut, bolts etc.)image

Stern Defense 16.1 inch 9mm barrel.

SD CB9 COMPENSATOR BREAK

Stern Defense assembled upper receiver with dust cover and forward assist.

Stern Defense SD BU9 Glock cut bolt.

SD CH1 enhanced charging handle.

Will come assembled.

Information:

Handguard.

The free float M-LOK handguard from Stern Defense offers excellent ergonomics while remaining lightweight and strong. This handguard is M-LOK compatible to accept your favorite attachments. Features a secure clamp on mounting system that ensures that the handguard remains in place even under heavy abuse, sustained full auto fire, and shooting prone from a bi-pod. Machined from 6061 aircraft grade aluminum and hard-coat anodized for longevity and durability. These handguards also feature quick disconnect swivel holes.

Also Included, Barrel Nut and Bolts.

Technical Information:

6061 aircraft grade aluminum.

Hard-coat anodized.

Sturdy construction.

Light weight construction.

Length 15 inches.

Smallest inside diameter 1.435 inches.

made in specialized factories

Barrel.

Stern 9mm barrels are ideal for gun lovers who want to build their own custom dedicated 9mm AR15 upper group. Our barrels offer an advantage over the competition. Every stern defense barrel throat is machined deeper for a longer free bore to accommodate bullets with a longer ogive. We have found that some common defense rounds jam into the rifling before the round is fully chambered. Some of the barrels on the market do not accommodate this and will potentially result in nasty malfunctions, resulting in a round being stuck in the chamber requiring manual methods to clear the malfunction.

Note: Barrel comes with locating pin installed.

Information:

Barrel length is measured in overall length from breech to muzzle.

Caliber: 9mm.

Length: 16.1 Inches.

made in specialized factories

Threaded .5-36.

1:10 TWIST.

4150 Chrome-moly steel.

Melonite coating.

Receiver.

Mil-Spec flat top upper receiver with Stern Defense laser engraved dust cover and forward assist. Machined from 7075-t6 aluminum and hard-coat anodized. Mil-spec dry film lube in the bore.

Technical Information:

7075-t6 aluminum

Hard-coat anodized.

Sturdy construction.

made in specialized factories

Charging Handle.

Mil-spec charge handle for AR-15 rifles. Laser engraved with Stern Defense logo. Our latch is Ergonomically designed and provides a positive grip and easy one hand manipulations while charging your weapon under stressful situations. Made from 6061 aircraft grade aluminum billet and hardcoat anodized.

Technical Information:

Laser engraved.

6061 aircraft grade aluminum billet

Hard coat anodized.

Sturdy Construction.

made in specialized factories

Bolt.

Made with 8620 AISI steel and boasting a Melonite finish, the Stern bolt fits into Mil-Spec and Glock-pattern upper receivers. It functions with Colt SMG, Glock magazines and it's fully compatible with standard AR15/M16 charging handles. Comes fully assembled with all sub-components installed, including firing pin/spring/retaining pin, extractor, and extractor spring. Also included in bolt assembly is a propriety center and roll pins.

Technical Information:

made in specialized factories

Constructed from 8620 AISI steel.

Custom 4140 billet extractor providing superior ejection.

Glock cut.

Coating: Melonite

Weight: 15.5 OZ.

9MM

COMP BREAK

Manufactured to the highest quality standards right here in the U.S.A. Full auto tested to ensure that the compensator ports keep muzzle rise to a minimum. The twin chamber ports guarantee that every last bit of usable gas is utilized to kill recoil. Machined from US Mil-spec AISI 4140 steel and black nitride coated to provide a lifetime of abuse. .

Note: Comes with crush washer.

Technical Information:

Full auto tested

US Mil-spec AISI 4140 steel.

Sturdy construction.

Black nitride coating

made in specialized factories

9MM

Threaded .5-36

Specifications for Stern Defense AR-15 16.1 inch Assembled 9mm Upper Receiver w/15 inch MLOK Rail:

Manufacturer: Stern Defense
Caliber: 9mm Luger
Barrel Length: 16.1 in
Muzzle Device: SCB 9 Comp Break
Finish: Matte
Color: Black
Gun Model: AR-15
Additional Features: Smallest inside diameter 1.435 inches., Light weight construction., Hard-coat anodized, 6061 aircraft grade aluminum., Sturdy Construction.
Condition: New
Magazine Included: No
Length: 15 in

Package Contents:

  • Stern Defense AR-15 16.1 inch Assembled 9mm Upper Receiver w/15 inch MLOK Rail

Stern Defense AR-15 16.1 inch Assembled 9mm Upper Receiver w/15 inch MLOK Rail Orderable Models

List of Orderable Models

  • Stern Defense AR-15 Upper Receiver, 9mm, 16.1in Barrel, 15in MLOK Rail, SD BU9 Bolt, SD CH1 Charging Handle, SCB 9 Comp Break, Black, 015-SD15INCHMOD4-KK , MPN: 015-SD15INCHMOD4MLOK16.1INCHBARREL9MM-KK , UPC: 860141001553 , Code: 3JS-URC-SD15M-015-SD15INCHMOD4-KK

Stern Defense AR-15 16.1 inch Assembled 9mm Upper Receiver w/15 inch MLOK Rail Unavailable & Discontinued Models

List of Unorderable Models

  • USED Stern Defense AR-15 Upper Receiver, 9mm, 16.1in Barrel, 15in MLOK Rail, SD BU9 Bolt, SD CH1 Charging Handle, SCB 9 Comp Break, Black, 015-SD15INCHMOD4-KK, EDEMO1, Condition Fair, Other , MPN: 015-SD15INCHMOD4MLOK16.1INCHBARREL9MM-KK , Code: 3JS-URC-SD15M-015-SD15INCHMOD4-KK-EDEMO-OT-D
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