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Barrel length on AR15/10

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Unread 09-28-2012, 08:46 PM
Gold Member
Join Date: Jul 2010
Location: Rathdrum Idaho
Posts: 572
Barrel length on AR15/10

just out of curiosity has anyone here ever put a long barrel on there AR-platform say in 24-26" length. I realize prob not real useable considering the platform. Just remembered a member in the photo section I believe had spare parts laying around and put a rifle together one evening. I believe it had a 26" barrel.
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Unread 09-29-2012, 09:52 AM
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Join Date: Feb 2012
Posts: 185
Re: Barrel length on AR15/10

I know DPMS actually offers a 24" barreled factory rig, along with other brands I'm sure.

As far as 26"+ goes, I'm sure somebody has done it, But you're right, it really isn't necessary on an AR-15 because it can't be chambered in any REALLY hot cartridges that would need such a long tube for good performance.

The exception would probably be the Olympic Arms guns chambered in the WSSM's, OSSM and .22-250. They'd benefit from longer barrels if Olympic arms would produce them.
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Unread 09-29-2012, 10:23 PM
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Join Date: Jan 2012
Posts: 81
Re: Barrel length on AR15/10

You will 26 inch barrels on match rifles (space guns) at high power matches. These are highly modified AR 15a
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Unread 10-01-2012, 10:56 AM
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Join Date: Feb 2009
Location: Sedalia, MO
Posts: 1,256
Re: Barrel length on AR15/10


Yes, they're perfectly usable on ARs, and will add some decent velocity to the 223s. Doesn't take a larger cartridge to "use" a longer barrel. we're talking about changing expansion ratios here, and increasing barrel length will benefit almost all centerfire bottlenecked cases. I use a 26" on one of my Match rifles (a Spacegun, as rhino suggested), and it adds a noticable velocity advantage over my 20" Service Rifles. You can get into issues on an AR about how well the receiver supports such a long barrel if it becomes too heavy, but ballistically, it's an advantage all the way across the board.

The flip side is true as well. The M4s, with their 14.5" (and even shorter) barrels are lighter, easier to handle and faster to employ than their 20" M16 counterparts, but they lose out ballistically. Less velocity, less energy, reduced terminal performance on the receiving end. Again, it's all just a matter expansion ratios vs. handling characteristics.
Kevin Thomas
Lapua USA
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Unread 10-02-2012, 06:19 AM
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Join Date: May 2007
Location: Texas
Posts: 535
Re: Barrel length on AR15/10

I have several 26" and one 28" barrel on my competition guns.
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Unread 10-02-2012, 07:01 AM
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Join Date: Mar 2008
Location: North Vernon, in
Posts: 267
Re: Barrel length on AR15/10

i have a 24" on my rock river and i am get 3016 feet per second with a 60 grain bullet, with the same load out of a 20" it only gets about 2800. that does not really matter out to 200 yards but past that the faster bullet makes things a lot better for drop and wind corrections. they both shoot .5 groups at 100 yards.
God is the true Provider of all things
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Unread 10-11-2012, 10:50 AM
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Join Date: May 2009
Location: roanoke,va.
Posts: 324
Re: Barrel length on AR15/10

Clemens, it really boils down to how you want to use it. No, a long barrel ain't easy to move fast and for short range work, hardly an advantage. But, if you're a match shooter or long range shooter, a long, heavier barrel is what I deem as necessary. I have four with 26" tubes and they are super accurate. Two are heavies and two are mid weights. I also have 24s and even a 16 inch in 300 Blackout. Each has it's niche in its usefulness.
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