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Stern Defense SD BU9 9mm Bolt Carrier for AR-15 Glock-Pattern Upper Receiver 004-SD BU9-D1-M Color: Black, Finish: Phosphate Chrome, 30% Off w/ Free Shipping

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Stern Defense SD BU9 Bolt Carrier, AR-15 Glock-Pattern Upper Receiver, 9mm, Black, 004-SD BU9-D1-M
Stern Defense SD BU9 Bolt Carrier, AR-15 Glock-Pattern Upper Receiver, 9mm, Black, 004-SD BU9-D1-M
Stern Defense SD BU9 Bolt Carrier, AR-15 Glock-Pattern Upper Receiver, 9mm, Black, 004-SD BU9-D1-M
Stern Defense SD BU9 Bolt Carrier, AR-15 Glock-Pattern Upper Receiver, 9mm, Black, 004-SD BU9-D1-M
Stern Defense SD BU9 Bolt Carrier, AR-15 Glock-Pattern Upper Receiver, 9mm, Black, 004-SD BU9-D1-M
Stern Defense SD BU9 Bolt Carrier, AR-15 Glock-Pattern Upper Receiver, 9mm, Black, 004-SD BU9-D1-M
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Stern Defense SD BU9 Bolt Carrier, AR-15 Glock-Pattern Upper Receiver, 9mm, Black, 004-SD BU9-D1-M
Stern Defense SD BU9 Bolt Carrier, AR-15 Glock-Pattern Upper Receiver, 9mm, Black, 004-SD BU9-D1-M
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Stern Defense SD BU9 Bolt Carrier, AR-15 Glock-Pattern Upper Receiver, 9mm, Black, 004-SD BU9-D1-M
Stern Defense SD BU9 Bolt Carrier, AR-15 Glock-Pattern Upper Receiver, 9mm, Black, 004-SD BU9-D1-M
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Stern Defense SD BU9 Bolt Carrier, AR-15 Glock-Pattern Upper Receiver, 9mm, Black, 004-SD BU9-D1-M
Stern Defense SD BU9 Bolt Carrier, AR-15 Glock-Pattern Upper Receiver, 9mm, Black, 004-SD BU9-D1-M
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Stern Defense SD BU9 Bolt Carrier, AR-15 Glock-Pattern Upper Receiver, 9mm, Black, 004-SD BU9-D1-M
Stern Defense SD BU9 Bolt Carrier, AR-15 Glock-Pattern Upper Receiver, 9mm, Black, 004-SD BU9-D1-M
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Stern Defense SD BU9 Bolt Carrier, AR-15 Glock-Pattern Upper Receiver, 9mm, Black, 004-SD BU9-D1-M

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Questions & Answers
Will this work well with a Aero Precision EPC-9 with a Fostech Echo 2 trigger? Expert Answer

The Stern Defense SD BU9 9mm Bolt Carrier should work fine with the Aero Precision EPC9 and Fostech Echo 2 Trigger.

by Hunter, Gear Expert, September 13, 2022
Is this trigger compatible with forced reset triggers like the W.O.T or the Alamo-15? Manufacturer Answer

It will work with W.O.T we have not yet tested it with the Alamo-15.

by STERN DEFENSE, Manufacturer, July 13, 2022
View All Q&A You Have a Question? Ask!
Customer Reviews
Helpful Positive Review
HAS NOT FAILED ONCE by Heity10, Verified Owner, November 8, 2020
This was is my first AR9 build and I wanted to use my Glock mags on it so I order the Stern Defense 9mm conversion and I paired it with the Stern Defense bolt carrier and I can’t be more pleased. Been to the range a few times to set a few things and ...
Read More...
1/1 found this helpful
Helpful Negative Review
Does not work with echo sport trigger by Gabe3039, August 29, 2020
I already had a 9mm bolt but as with most as far as the echo sport trigger the hammer slot is to naefor the hammer lock. So instead of modifying the bolt I had I decided to get the stern defense bolt, I plan on building another 9mm anyway. Stearns bo...
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1/4 found this helpful
Most Recent Reviews
AR-9 Build by Pete P., Verified Owner, November 25, 2025
I had an AR-9 upper and wanted to finish my build (for an M&P type). I had no issues with this dropping in and cycling with the PSA upper, the Anderson lower wearing a Stern magwell adapter.
0/1 found this helpful
Most Recent Reviews
Good products by Joey, March 7, 2024
I m doing an ar9 build and needed a bcg for it . My friend suggested optics planet . I purchased a stem defense SD bu9 . I haven’t shot mine yet but I did try my friend’s it fired flawlessly that’s why I decided to purchase it. Seems to be high qual...
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0/1 found this helpful
Most Recent Reviews
Stern Defense SD BU9 bolt carrier by weldr123, Verified Owner, May 21, 2025
I purchased this bolt carrier and paired it with a Stern Defense MAG-AD9 AR-15 Glock 9mm/.40 Magazine Conversion Adapter. I just didn't like the Colt magazines or the Colt style conversion block. I am 100% satisfied with my purchase and would buy it ...
Read More...
0/1 found this helpful
Most Recent Reviews
Bolt is a Gem by MLEW, Verified Owner, August 1, 2025
Works flawlessly with Fostech Echo Binary Trigger! Fit and finish are excellent!
0/1 found this helpful
Read All 8 Reviews
Color:
Black
Finish:
Phosphate Chrome
Caliber:
9mm Luger
Gun Make:
AR Platform
Gun Model:
AR-15
Hand:
Right
Weight:
15.5 oz
Condition:
New
Additional Features:
Compatible with single stage short reset triggers, Compatible with the Echo trigger., Compatible with the JP Silent capture spring, Compatible with the Law Folding Tactical Stock, Constructed from 8620 AISI steel, Custom 4140 billet extractor providing superior ejection.

Code: 3JS-BCG-SDBU9-004-SD-BU9-D1-M

MPN: 004-SD BU9-D1-M

UPC: 860141001522

List: $185.99Save 30%
$129.99

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OP Bucks$2.60

Product Info for Stern Defense SD BU9 9mm Bolt Carrier for AR-15 Glock-Pattern Upper Receiver

Get a factory made bolt carrier at a fraction of the cost with this one. These Bolt Carrier Groups from the experts at Stern Defense are built with Melonite coatings on 8620 AISI steel with a melonite finish to reduce friction and increase reliability. The Stern Defense Glock Pattern 9mm Bolt Carrier fits Mil-Spec and Glock-pattern upper receivers, and it's compatible with Glock magazines and standard AR15/M16 charging handles. Further, it functions with Colt SMG and Glock magazines, so you can use it with your Glock pistol. Install this bolt carrier in your Glock and Mil-Spec rifle upper receivers to get a durable and reliable bolt carrier group. Pick up this 9mm BCG for your AR or Glock firearm.image

Specifications for Stern Defense SD BU9 9mm Bolt Carrier for AR-15 Glock-Pattern Upper Receiver:

Manufacturer: Stern Defense
Color: Black
Finish: Phosphate Chrome
Fabric/Material: Melonite
Carrier Material: 8620 Steel
Bolt Material: 8620 Steel
Caliber: 9mm Luger
Gun Make: AR Platform
Gun Model: AR-15
Hand: Right
Weight: 15.5 oz
Condition: New
Additional Features: Constructed from 8620 AISI steel, Custom 4140 billet extractor providing superior ejection., Compatible with single stage short reset triggers, Compatible with the JP Silent capture spring, Compatible with the Echo trigger., Compatible with the Law Folding Tactical Stock

Package Contents:

  • Stern Defense SD BU9 9mm Bolt Carrier for AR-15 Glock-Pattern Upper Receiver

What firearm models does the manufacturer say Stern Defense SD BU9 9mm Bolt Carrier for AR-15 Glock-Pattern Upper Receiver is compatible with?

The manufacturer suggests that Stern Defense SD BU9 9mm Bolt Carrier for AR-15 Glock-Pattern Upper Receiver is compatible with AR-15

Stern Defense SD BU9 9mm Bolt Carrier for AR-15 Glock-Pattern Upper Receiver Orderable Models

List of Orderable Models

  • Stern Defense SD BU9 Bolt Carrier, AR-15 Glock-Pattern Upper Receiver, 9mm, Black, 004-SD BU9-D1-M , MPN: 004-SD BU9-D1-M , UPC: 860141001522 , Code: 3JS-BCG-SDBU9-004-SD-BU9-D1-M

Stern Defense SD BU9 9mm Bolt Carrier for AR-15 Glock-Pattern Upper Receiver Unavailable & Discontinued Models

List of Unorderable Models

  • USED, Stern Defense SD BU9 Bolt Carrier, AR-15 Glock-Pattern Upper Receiver, 9mm, Black, 004-SD BU9-D1-M , MPN: 004-SD BU9-D1-M-EDEMO , Code: 3JS-BCG-SDBU9-004-SD-BU9-D1-M-EDEMO-OB-B
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