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Q&A for Stern Defense SD BU9 NiB ECHO 9mm Bolt Carrier for AR-15 Glock-Pattern Upper Receiver — 37 Questions & 39 Answers

Name Stern Defense SD BU9 NiB ECHO 9mm Bolt Carrier for AR-15 Glock-Pattern Upper Receiver (4.6)
$237.98 $169.99 Save 29%
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Q
Tim, guest, from OR, United States, asked on November 30, 2021

Does this work for the standard magpul gen2 mags w/ 9mm conversion? Or is it just compatible with the colt and glock mags? Thanks

Expert Answer
A
Answered by Hunter, Gear Expert, from OH, United States, on January 24, 2022

This Stern Defense SD 9mm Bolt Carrier should be compatible the Magpul Gen 2 Mags but I would contact the manufacturer to confirm.

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Q
GMan, member, from WA, United States, asked on December 07, 2019

Will this work with Quarter Circle 9mm side charging upper?

Expert Answer
A
Answered by Armando R., Gear Expert, from IL, United States, on February 11, 2020

Yes, it should be compatible with the Quarter Circle 10 side charging uppers.

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Q
WVdavidB, member, from WV, United States, asked on March 28, 2019

Is it safe to remove the weight in the rear of the bolt to allow it to function with a JP silent capture buffer/spring?

Expert Answer
A
Answered by Armando R., Gear Expert, from IL, United States, on June 13, 2019

Yes, the rear/center weight can be removed to function with the JP Silent Capture Spring.

0 of 3 found the following answer helpful.
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Q
Robert Shivers, member, from TX, United States, asked on December 27, 2024

Does this bcg have an interchangeable bcg weight?

Manufacturer Answer
A
Answered by STERN DEFENSE, Manufacturer from MO, United States, on March 26, 2025

Our bolt has a easy to remove weight. There are not other weights to put into it. You can remove it and use it with the JP silent capture spring or the law folder.

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Q
David, guest, from MI, United States, asked on March 16, 2024

Is the diameter of the removable weight in the rear 1/2 or 5/8.

Manufacturer Answer
A
Answered by STERN DEFENSE, Manufacturer from MO, United States, on November 27, 2024

It is stepped. .692 and then further in at .494

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Q
Thomas, member, from VA, United States, asked on September 15, 2023

Will this BCG WORK WITH THE FREEDOM ORDINANCE ORDINANCE FX9?

Expert Answer
A
Answered by Hunter, Gear Expert, from OH, United States, on September 20, 2023

The Stern Defense SD BU9 NiB ECHO 9mm Bolt Carrier will not work in the FX9.

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Q
Bmg, member, from MO, United States, asked on February 05, 2023

Will this work with a binary trigger

Expert Answer
A
Answered by Hunter, Gear Expert, from OH, United States, on November 29, 2023

The Stern Defense SD BU9 NiB ECHO 9mm Bolt Carrier for AR-15 Glock-Pattern Upper Receiver is compatible with the ECHO Trigger.

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Q
Anthony Guerrero, member, from TX, United States, asked on January 12, 2023

Is this full auto rated ?

Expert Answer
A
Answered by Ethan, Gear Expert, from IL, United States, on April 10, 2023

Yes, the Stern Defense SD BU9 NiB ECHO 9mm Bolt Carrier is rated for full auto use and works with the Echo Trigger as well as single stage short reset triggers.

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Q
Tdn7340, member, from GA, United States, asked on December 25, 2022

I have an AR Stoner AR15 EV2 upper in 9mm will this bolt work

Expert Answer
A
Answered by Hunter, Gear Expert, from OH, United States, on January 17, 2023

The Stern Defense SD BU9 NiB ECHO 9mm Bolt Carrier will work with that upper receiver.

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Q
Tdn7340, member, from GA, United States, asked on November 26, 2022

I have an AR stoner 9mm upper on milspec AR15 lower using a stern defense mag adapter for glock mags will this bcg work

Manufacturer Answer
A
Answered by STERN DEFENSE, Manufacturer from MO, United States, on December 15, 2022

We do not recommend AR stoner bolts with our MAG-AD. We have found that due to the way their bolt is ramped that over time it damages our bolt catch lifter.

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