Q&A for Stern Defense AR-15 10 inch Assembled Upper Receiver, 8.5 in 9mm Barrel w/MLOK Rail

Stern Defense AR-15 10 inch Assembled Upper Receiver, 8.5 in 9mm Barrel w/MLOK Rail

$486.45 $476.45 Save $10.00

View Product

Write a Review

Ask Your Question

Please keep questions related to the product! If you have questions regarding availability, pricing, or shipping options for this item, please contact our customer service team.

Need an answer right now?

Continue As a Guest

Nickname

Country

State

Saving...

or Register

Having an account with OpticsPlanet.com makes writing questions and answers even better! We’ll save all of your questions and answers in your account, provide you easy access to them, so you can see how the community has responded.

If you’d like to add a question without creating an account, you can proceed with filling out the fields on this form.

Show

Sort by

Filter by

John, member, from FL, United States, asked on March 15, 2025

What lower is compatible with upper. I know there are different ones.

Manufacturer Answer

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

If you are using our MAG-AD then any Mil Spec lower will work.

Was it helpful to you? Yes | No

Submit Your Answer

Compare

Steven G, member, from TX, United States, asked on January 05, 2025

Can it use plus P ammo 147 grain

Manufacturer Answer

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

Yes, please make sure you are using a heavy buffer. We typically recommend 5.4 ounces with 9mm but with plus P probably would be better to use 7.5 ounces.

Was it helpful to you? Yes | No

Submit Your Answer

David Mcmichael, member, from TX, United States, asked on April 09, 2022

What is the thread pattern and which muzzle device will work for this barrel

Expert Answer

Answered by Hunter, Gear Expert, from OH, United States, on April 19, 2022

The Stern Defense AR-15 10 inch Assembled Upper Receiver, 8.5 in 9mm Barrel is threaded for 1/2x36. There are a variety of muzzle devices that will fit a 9mm barrel with those threads but you need to decide what kind of muzzle device you want. For example the muzzle brake at the link below would work.
https://www.opticsplanet.com/fortis-manufacturing-9mm-red-muzzle-brake-pcc-mod-2.html?_iv_threads-per-inch=1-sl-2x36&_iv_code=2GN-BMB-9REDPM2-9MM-RED-M2-36

Was it helpful to you? Yes | No

Submit Your Answer

Tyllla, guest, from FL, United States, asked on November 16, 2021

Does this have lrbho

Expert Answer

Answered by Hunter, Gear Expert, from OH, United States, on January 11, 2022

Please email us at techsales@opticsplanet.com.

Was it helpful to you? Yes | No

Submit Your Answer

Rocky Phatdouang, member, from CA, United States, asked on October 16, 2021

Can I use endo mags on this as upper??

Expert Answer

Answered by Alex O., Gear Expert, from IL, United States, on November 17, 2021

Yes, this has glock variant BCG. Mean Arms states that the endo mag will work with any 9mm upper with a glock or colt variant bolt.

Was it helpful to you? Yes | No

Submit Your Answer

Gunny, member, from PA, United States, asked on May 31, 2021

Is the Stern Defense AR-15 9mm upper blowback operated or gas operated?

Expert Answer

Answered by Tom B, Gear Expert, from IL, United States, on August 23, 2021

It is blowback operated.

Was it helpful to you? Yes | No

Submit Your Answer

Jay, member, from WI, United States, asked on February 08, 2021

What's the inside diameter of the handguard, for the purposes of under barrel suppressor fitment

Expert Answer

Answered by Ben, Gear Expert, from UT, United States, on February 26, 2021

Please email us at techsales@opticsplanet.com so we can further answer your question.

0 of 1 found the following answer helpful.

Was it helpful to you? Yes | No

Submit Your Answer

Jake, member, from NC, United States, asked on January 17, 2021

Is it recommended/do you need to change the buffer weight on a standard ar-15 (5.56x45) lower in order for this to run reliably & if so what weights ?

Expert Answer

Answered by Ben, Gear Expert, from UT, United States, on February 26, 2021

An H3 buffer is recommended for 10" barrels.

Was it helpful to you? Yes | No

Submit Your Answer

Verndogg, member, from CA, United States, asked on January 12, 2021

What size buffer do I need for this? Can I use the standard 5.56 carbine buffer my stag15 tactical came with?

Expert Answer

Answered by Ben, Gear Expert, from UT, United States, on February 26, 2021

I would recommend an H3 buffer weight system.

1 of 1 found the following answer helpful.

Was it helpful to you? Yes | No

Submit Your Answer

David Delgado, member, from TX, United States, asked on January 04, 2021

will this fit any regular 5.56 lowers?

Expert Answer

Answered by Ben, Gear Expert, from UT, United States, on February 26, 2021

Yes, these will fit standard AR-15 lowers.

1 of 1 found the following answer helpful.

Was it helpful to you? Yes | No

Submit Your Answer

More Deals

Q&A for Stern Defense AR-15 10 inch Assembled Upper Receiver, 8.5 in 9mm Barrel w/MLOK Rail — 26 Questions & 24 Answers

What lower is compatible with upper. I know there are different ones.

Can it use plus P ammo 147 grain

What is the thread pattern and which muzzle device will work for this barrel

Does this have lrbho

Can I use endo mags on this as upper??

Is the Stern Defense AR-15 9mm upper blowback operated or gas operated?

What's the inside diameter of the handguard, for the purposes of under barrel suppressor fitment

Is it recommended/do you need to change the buffer weight on a standard ar-15 (5.56x45) lower in order for this to run reliably & if so what weights ?

What size buffer do I need for this? Can I use the standard 5.56 carbine buffer my stag15 tactical came with?

will this fit any regular 5.56 lowers?

FREE SHIPPING on Over 250,000 Products

Enjoy our FREE RETURNS

More Deals

Q&A for Stern Defense AR-15 10 inch Assembled Upper Receiver, 8.5 in 9mm Barrel w/MLOK Rail — 26 Questions & 24 Answers