Barrel for 7.62x39 ARR build

sevt_chevelle · February 24, 2019, 11:47 AM

Looking at building a 7.62x39 AR, wanting something to run steel cased ammo through. I have several 556 builds all ready and a few spare receiver sets laying around.

Any suggestions on barrels, am leaning towards a 16" middy?
Thoughts on these.

https://faxonfirearms.com/16-gunner-...ngth-4150-qpq/
https://www.blackriflearms.com/16-76...rel_p_168.html

What barrels are you guys running?
Thanks.

Sharkbite · February 24, 2019, 02:56 PM

Ive used Faxon barrels in 2 of my 556 builds. Im very pleased with the quality and the company is super good to work with. I had lunch with the owner at SHOT show a cpl years ago. Good people.

Mobuck · February 24, 2019, 04:20 PM

Not so sure of the advantages with a "middy 7.62" especially using factory ammo. My reason: I feel that this type of ammo uses fairly "quick" powder that may already be at the top of it's performance with a carbine gas system.

sevt_chevelle · February 27, 2019, 05:45 PM

It just seems the more respected brands of barrels are using the mid length system, good bad I don't know

Mobuck · February 27, 2019, 08:55 PM

With a 223/5.56 barrel the gas volume is confined to a much smaller volume vs a 7.62 bore. Moving the gas port forward is usually advantageous with a .22 bore but may not be with the bigger .30 bore. In addition, the 7.62x39 doesn't have the same chamber pressure as a .223.

NYPD13 · March 2, 2019, 10:17 AM

I run a 16" heavy contour, mid length gas port, carbine buffer. Runs just fine. Prefers hot reloads and steel case. Upgrade to a heavy duty extractor spring, the stock one with the o ring that came with my bolt wore out fairly quickly.

Hdonly · March 14, 2019, 07:01 PM

My BCA 7.62x39 upper on an Anderson lower shoots anything I put in it. I am as happy as I can be with it. My pig gun.

February 24, 2019, 11:47 AM	#1
sevt_chevelle Senior Member Join Date: April 13, 2013 Posts: 324	Barrel for 7.62x39 ARR build Looking at building a 7.62x39 AR, wanting something to run steel cased ammo through. I have several 556 builds all ready and a few spare receiver sets laying around. Any suggestions on barrels, am leaning towards a 16" middy? Thoughts on these. https://faxonfirearms.com/16-gunner-...ngth-4150-qpq/ https://www.blackriflearms.com/16-76...rel_p_168.html What barrels are you guys running? Thanks.

March 2, 2019, 10:17 AM	#6
NYPD13 Senior Member Join Date: September 10, 2008 Posts: 370	I run a 16" heavy contour, mid length gas port, carbine buffer. Runs just fine. Prefers hot reloads and steel case. Upgrade to a heavy duty extractor spring, the stock one with the o ring that came with my bolt wore out fairly quickly. __________________ "THE CONSTITUTION ONLY GIVES PEOPLE THE RIGHT TO PURSUE HAPPINESS, YOU HAVE TO CATCH IT YOURSELF." ~BENJAMIN FRANKLIN.

February 24, 2019, 02:56 PM	#2
Sharkbite Senior Member Join Date: November 4, 2013 Location: Western slope of Colorado Posts: 3,679	Ive used Faxon barrels in 2 of my 556 builds. Im very pleased with the quality and the company is super good to work with. I had lunch with the owner at SHOT show a cpl years ago. Good people.

February 24, 2019, 04:20 PM	#3
Mobuck Junior member Join Date: February 2, 2010 Posts: 6,846	Not so sure of the advantages with a "middy 7.62" especially using factory ammo. My reason: I feel that this type of ammo uses fairly "quick" powder that may already be at the top of it's performance with a carbine gas system.

February 27, 2019, 05:45 PM	#4
sevt_chevelle Senior Member Join Date: April 13, 2013 Posts: 324	It just seems the more respected brands of barrels are using the mid length system, good bad I don't know

February 27, 2019, 08:55 PM	#5
Mobuck Junior member Join Date: February 2, 2010 Posts: 6,846	With a 223/5.56 barrel the gas volume is confined to a much smaller volume vs a 7.62 bore. Moving the gas port forward is usually advantageous with a .22 bore but may not be with the bigger .30 bore. In addition, the 7.62x39 doesn't have the same chamber pressure as a .223.

March 14, 2019, 07:01 PM	#7
Hdonly Senior Member Join Date: January 5, 2013 Posts: 340	My BCA 7.62x39 upper on an Anderson lower shoots anything I put in it. I am as happy as I can be with it. My pig gun.