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Questions & Answers
Will the Stern 45 BC work with a Foxtrot Mike 45 Upper and Lower? Is the ejection port from FM 45 large enough to work with the Stern 45 BC?

While we have not specifically tested it with that upper, based on its design, we do not anticipate any compatibility issues

by Stern Defense, Verified Owner, July 15, 2025
Is this compatible with the stern defense mag ad m&p 45 acp magwell adapter if used in a foxtrot mikes mike 45 upper? Manufacturer Answer

Yes it is.

by STERN DEFENSE, Manufacturer, November 27, 2024
Customer Reviews
Helpful Positive Review
Good Quality BCG by IanMT, October 3, 2020
Using on a Foxtrot Mike build. Feeds like a dream with the right mags. But beware, I was using the recommended 11oz buffer I got at Midway and it was too short. The faux gas key was hitting the lower receiver and sheared off. Totally my fault. R...
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1/1 found this helpful
Helpful Positive Review
Quality 45 BCG by Chris, December 29, 2018
I bought this bolt carrier for my latest 45 build and couldn’t be more pleased. Quality is evident in the fit and finish with even coating and nice clean machining lines. Function has been flawless through several hundred rounds now. I would definite...
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1/1 found this helpful
Most Recent Reviews
Best BCG for 45 I could find by HC, Verified Owner, December 4, 2025
This is used in a Pro2a and Tacfire 45acp uppers, and functions dependably in both. No misfeeds or problems cycling in either. Very well built. Much better than the Tacfire version which came with one of my uppers, that one constantly misfed hollo...
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Most Recent Reviews
Big Bolt45 by Ddubs, Verified Owner, August 9, 2025
It looks and fits great! Heavy duty. Just what I needed for my ar45 set up.
Most Recent Reviews
Great bolt by Nathan, Verified Owner, August 25, 2020
I live in Cali, so I had to use a Mag-Ad, and the Stern was my choice from reputation, and their reputation holds true. Great quality bolt. If you are using the Stern Mag-Ad, you HAVE to use this bolt. The Stern Mag-Ad takes S&W mags, so you are limi...
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Read All 5 Reviews
Color: Black Finish: Phosphate Chrome Caliber: .45 ACP Gun Make: AR Platform Gun Model: AR-15 Weight: 15.5 ozCondition: New Additional Features: Compatible with single stage short reset triggers , Compatible with the Echo trigger. , Compatible with the JP Silent capture spring(not recommended for 45acp) , Compatible with the Law Folding Tactical Stock , Constructed from 8620 AISI steel , Custom 4140 billet extractor providing superior ejection.

Code: 3JS-BCG-SDBU-004-SD-BU45-D1-M

MPN: 004-SD BU45-D1-M

UPC: 850001176057

List: $210.00Save 28%
$150.65

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Product Info for Stern Defense SD BU45 .45 ACP Bolt Carrier for AR-15 Glock-Pattern Upper Receiver

THIS MUST BE USED WITH A 11 OUNCE BUFFER OR HEAVIER WHEN USING A CARBINE SPRING.image

45ACP UPPERS MUST HAVE AN ENLARGED EJECTION PORT.

WHILE OUR 45 BOLT WILL ACCOMMODATE A JP SILENT CAPTURE SPRING. WE DO NOT RECOMMEND IT AS 45ACP CAN DAMAGE THE JP SYSTEM.

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. Our 45 bolts incorporate our new bolt design which caters to single stage triggers with short resets. It also allows use with the JP silent capture spring but is not recommend for 45acp applications. This bolt is compatible with the law tactical folding stock.

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.

45acp

Compatible with single stage short reset triggers.

Compatible with the Law Folding Tactical Stock

Compatible with the JP Silent capture spring(not recommended for 45acp)

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Specifications for Stern Defense SD BU45 .45 ACP 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: .45 ACP
Gun Make: AR Platform
Gun Model: AR-15
Weight: 15.5 oz
Condition: New
Additional Features: Compatible with the JP Silent capture spring(not recommended for 45acp), Compatible with the Echo trigger., Compatible with the Law Folding Tactical Stock, Compatible with single stage short reset triggers, Custom 4140 billet extractor providing superior ejection., Constructed from 8620 AISI steel

Package Contents:

  • Stern Defense SD BU45 .45 ACP Bolt Carrier for AR-15 Glock-Pattern Upper Receiver

Stern Defense SD BU45 .45 ACP Bolt Carrier for AR-15 Glock-Pattern Upper Receiver Orderable Models

List of Orderable Models

  • Stern Defense SD BU45 Bolt Carrier, AR-15 Glock-Pattern Upper Receiver, .45 ACP, Black, 004-SD BU45-D1-M , MPN: 004-SD BU45-D1-M , UPC: 850001176057 , Code: 3JS-BCG-SDBU-004-SD-BU45-D1-M

Stern Defense SD BU45 .45 ACP Bolt Carrier for AR-15 Glock-Pattern Upper Receiver Unavailable & Discontinued Models

List of Unorderable Models

  • USED Stern Defense SD BU45 Bolt Carrier, AR-15 Glock-Pattern Upper Receiver, .45 ACP, Black, 004-SD BU45-D1-M, EDEMO1, Used, Condition Fair , MPN: 004-SD BU45-D1-M-EDEMO1 , Code: 3JS-BCG-SDBU-004-SD-BU45-D1-M-EDEMO1
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