AR10 barrel on DPMS style upper ?

[GeorgeG]

During the deepest, darkest days of The Great Pandemic I assembled a .308AR using the information on this site. It has operated flawlessly! Many thanks for all the good information. Now would like build another upper, I have on hand a DPMS style upper and bcg, I can get a lightly very used Armalite 16" barrel for a reasonable price. Will this work? What is needed besides AR10 bolt and firing pin if it will work. Are the bolts interchangeable in bcgs?  Are barrel extensions interchangeable between the platforms?  Bought the receiver ext. spring and buffer directly from Armalite when assembling .308AR, now don't see the option to buy parts on their site. Any information you can share is greatly appreciated. Is this just a dumb idea that would not be worth the effort?

Thank you, 

George

 

[98Z5V]

George, somewhere here, I was involved in a deep dive we did on those types of the BCGs, both DPMS and Armalite.  I have both, and did the measurements and comparison pics.  There are very slight differences in the BCG bodies.  The OAL is the same.  I think you'd need the Armalite BCG body, the actual carrier, as well as the bolt.  SAC, Strategic Armory Corps, Inc, owns Armalite now.  I'll find their website with contact info.

I'll try to find that thread with the details.

I know for a fact that you can run all Armalite AR10 guts in a DPMS based receiver set, and built one to test as proof of concept.  It runs flawlessly.  Armalite barrel, BCG and recoil system running inside the Aero Precision M5 receiver set. 

  https://sacfirearms.com/

1395 N Harvey Mitchell Pkwy

Bryan, Texas 77803

• Email: salesorders@sacfirearms.com
• Phone: 979-326-1300
• Sales Visits By Appointment Only

[98Z5V]

George, 

Here is Pg 2 of the thread I was talking about, with the BCG body differences...

 

[Armed Eye Doc]

It is never a dumb idea to build another gun.  

Armalite parts are sold here now.

https://everygunpart.com/manufacturer/armalite

They are not listing the AR10 receiver extension kit at the moment.  They do have a complete BCG available as well as the buffer spring.

[GeorgeG]

Thanks for all the info, interesting reading, read it all once, some parts 2-3 times. Going to look at the barrel tomorrow. The information you posted about rifle length gas tubes saved me a lot of headaches. I was able to steer my son-in-law in the right direction a few months later when he put one together. Both rifles have run flawlessly................................George

[Cunuckgaucho]

On 12/4/2025 at 8:16 PM, Armed Eye Doc said:

It is never a dumb idea to build another gun.  

Truth