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Q&A for Stern Defense SD BU9 9mm Bolt Carrier for AR-15 Glock-Pattern Upper Receiver — 11 Questions & 10 Answers

Name Stern Defense SD BU9 9mm Bolt Carrier for AR-15 Glock-Pattern Upper Receiver (4.7)
$181.20 $129.99 Save 28%
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Q
Gunnar Poppinga, member, from OK, United States, asked on September 01, 2022

Will this work well with a Aero Precision EPC-9 with a Fostech Echo 2 trigger?

Expert Answer
A
Answered by Hunter, Gear Expert, from OH, United States, on September 13, 2022

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

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Q
Logan, member, from IA, United States, asked on June 20, 2022

Is this trigger compatible with forced reset triggers like the W.O.T or the Alamo-15?

Manufacturer Answer
A
Answered by STERN DEFENSE, Manufacturer from MO, United States, on July 13, 2022

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

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Q
Cmonñgetem, member, from PA, United States, asked on March 26, 2021

Is the standard sizing 5/8 ID or (.625)?

Manufacturer Answer
A
Answered by STERN DEFENSE, Manufacturer from MO, United States, on May 25, 2022

Our weight is not a standard 5/8 (.625) bore. We designed it to accommodate accessories like the law tactical folding stock.

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Q
Kolton Williams, member, from LA, United States, asked on November 14, 2020

Is this a delay bcg or direct?

Expert Answer
A
Answered by Armando R., Gear Expert, from IL, United States, on January 22, 2021

This is a straight blow back bolt and is not delayed or radial in nature.

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Q
Nick, member, from DE, United States, asked on November 13, 2020

Ordered the wrong stern defense mag adaptor. Will this work with the p320 stern mag setup in the mag well

Expert Answer
A
Answered by Armando R., Gear Expert, from IL, United States, on January 22, 2021

From the information available on Stern Defense's website, they state that the P320 adapter will work with a Glock cut bolt which this is, so it should be compatible.

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Q
BakezCakez, member, from CA, United States, asked on August 25, 2020

Does this work well with Mean Arms Endomags?

Expert Answer
A
Answered by Armando R., Gear Expert, from IL, United States, on January 22, 2021

This is only meant to be compatible with Glock and Colt SMG magazines.

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Q
Gabe3039, member, from OH, United States, asked on August 08, 2020

Will this bolt work with a Spike's dedicated colt 9mm lower?

Expert Answer
A
Answered by Armando R., Gear Expert, from IL, United States, on January 22, 2021

Yes, it should be compatible as this bolt carrier is compatible with both Colt SMG and Glock magazines.

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Q
Johnnie, member, from WA, United States, asked on June 19, 2020

Will this work with the 9mm Smith and Wesson M&P Stern Defense magazine well adapter?

Expert Answer
A
Answered by Armando R., Gear Expert, from IL, United States, on January 22, 2021

This bolt carrier group is compatible with that adapter as Stern Defense shows on their website that the M&P/P320 adapter work with a Glock cut bolt carrier and this is Glock cut.

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Q
Brooks, member, from NC, United States, asked on May 06, 2020

Is this bolt carrier compatible with standard AR charging handles?

Expert Answer
A
Answered by Armando R., Gear Expert, from IL, United States, on January 22, 2021

Yes, the Stern SD BU9 bolt carrier group will work with standard AR-15 charging handles.

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Q
RITradhunter, member, from RI, United States, asked on September 28, 2019

How much does this BCG weigh?

Expert Answer
A
Answered by Ethan C., Gear Expert, from IL, United States, on October 18, 2019

With the weight installed this weighs 15.5oz. With the weight removed, this weighs 13.3oz.

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