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 How many rounds can be fired consecutively, without overheating or damaging a Mil-spec AR-15?
GardensandGuns  [Member]
9/3/2012 12:03:04 PM
Finally got my Ar-15 functioning. Used 16 inch chrome lined 1/9 twist barrel from ftf industies cerro forge. Stag Lower. Put 200 rounds through it over four hours at the range, rotating with my gsg and pistols. I would think that is nothing for an AR? How many rounds do you shoot when you are at the range? Can you empty a 100 round beta mag and what would be the effect to the rifle. Thanks
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103  [Team Member]
9/3/2012 12:10:12 PM
I think for a 14.5 M4 barrel, it's around 400 rounds in F/A to failure. But even small breaks greatly extend the number. For semi-auto? You could probably keep going and going.
evlblkwpnz  [Team Member]
9/3/2012 12:11:19 PM
16" 1/9 twist barrel is not milspec. It should be fine though with a Beta dump. I say raise hell with it and find its limit.
bassist  [Team Member]
9/3/2012 12:11:53 PM
eric496  [Team Member]
9/3/2012 12:45:14 PM
It's a boring video, but you get the point.

Kujoe  [Team Member]
9/3/2012 12:51:42 PM
Also depends on the rifle as well...

http://www.youtube.com/watch?v=vx2JDG7Rxt4
durabo  [Team Member]
9/3/2012 12:55:14 PM
Also it should be noted that you are in OH like me... we are not allowed to USE things like 100rd beta mags. Owning them is fine -

http://www.ar15.com/forums/t_8_12/318417_Ohio_s_magazine_limit.html

jaqufrost  [Team Member]
9/3/2012 12:55:25 PM
I have done a 100rd beta dump with a 14.5" midlength on full auto. Gas tube glowed and later had some corrosion issues (on the gas tube), but never any failures. I swapped to the Spikes melonited gas tube to prevent the corrosion issues in the future.
nhsport  [Team Member]
9/3/2012 1:24:27 PM
I believe that a semi gun is pretty hard to work to the point of abuse.

If you do go at it real hard the gas tube and hand guards will be most at risk along with some other cosmetic issues but actual dammage to the barrel itself or the rest of the gun is pretty unlikely
carbineone1964  [Member]
9/3/2012 1:29:18 PM
I do not know how the MilSpec ones do but I have never started my non MilSpec one on fire So a MilSpec one should really take a beating.
AeroScout23  [Member]
9/3/2012 1:55:47 PM
Originally Posted By bassist:
http://www.youtube.com/watch?v=S6cwh4IxXSc


Great video for those who dont believe in AR ruggedness. Now I wonder how long until wood AK furniture would catch on fire.
NotIssued  [Member]
9/3/2012 2:11:49 PM
does the guy in that second video not know he has a bolt release? Why does he keep racking the CH?
1IV  [Team Member]
9/3/2012 2:16:08 PM
I burned 12 in 5 minutes on a KD team pop up range. My teammate in the hole had a critical failure at the first mag. He stacked mags infont of me and called targets. We came in 3rd for the company. My rifle was smoking. No ill effects. I was firing on burst. It was glorious.
1IV  [Team Member]
9/3/2012 2:16:50 PM
Originally Posted By NotIssued:
does the guy in that second video not know he has a bolt release? Why does he keep racking the CH?


Bolt release is for parades and inspections.
bassist  [Team Member]
9/3/2012 2:18:49 PM
Originally Posted By NotIssued:
does the guy in that second video not know he has a bolt release? Why does he keep racking the CH?


Could the bolt release perhaps be covered by the enormous fixture holding the rifle in place from the left side?
TeeRex  [Team Member]
9/3/2012 2:29:05 PM

Originally Posted By NotIssued:
does the guy in that second video not know he has a bolt release? Why does he keep racking the CH?

It is blocked by what the gun is mounted on.
Gamma762  [Team Member]
9/3/2012 3:51:30 PM
There are very different interpretations of "damage".

There is the line of thinking that as long as you haven't burst the barrel you are ok. Much of that so far in this thread.

Excessive heat from high intensity firing schedules does radically increase the crazing of the chrome lining leading to erosion in the bore, which greatly accelerates barrel "wear". So 500 rounds in 5 minutes is going to cause much more "wear" than would 500 rounds in 5 hours.

So depends on the rifle usage, the barrel material and finishes, barrel quality (ie precision), and what kind of life and usage you expect out of your barrel.

If you mag dumped 90 rounds though a high end service match stainless barrel, a competitive match shooter would likely consider it damaged if not ruined. If you mag dumped 90 rounds though a worn out chrome lined HBAR carbine barrel, a casual shooter would likely consider it just getting warmed up.
tpelle  [Member]
9/3/2012 4:14:41 PM
Originally Posted By Gamma762:
There are very different interpretations of "damage".

There is the line of thinking that as long as you haven't burst the barrel you are ok. Much of that so far in this thread.

Excessive heat from high intensity firing schedules does radically increase the crazing of the chrome lining leading to erosion in the bore, which greatly accelerates barrel "wear". So 500 rounds in 5 minutes is going to cause much more "wear" than would 500 rounds in 5 hours.

So depends on the rifle usage, the barrel material and finishes, barrel quality (ie precision), and what kind of life and usage you expect out of your barrel.

If you mag dumped 90 rounds though a high end service match stainless barrel, a competitive match shooter would likely consider it damaged if not ruined. If you mag dumped 90 rounds though a worn out chrome lined HBAR carbine barrel, a casual shooter would likely consider it just getting warmed up.


Very true.

Previous replies to this thread interpreted your question in terms of shooting it to destruction. However, if you are asking about sustained fire rate without DAMAGING your barrel, I recall the military uses a rate of 11 or 12 rounds per minute.
1saxman  [Member]
9/3/2012 4:28:29 PM
TM 9-1005-249-10

Max. rate of fire semi-auto is 45 to 65 RPM
AR_Tech  [Team Member]
9/3/2012 4:39:18 PM
Originally Posted By tpelle:
Originally Posted By Gamma762:
There are very different interpretations of "damage".

There is the line of thinking that as long as you haven't burst the barrel you are ok. Much of that so far in this thread.

Excessive heat from high intensity firing schedules does radically increase the crazing of the chrome lining leading to erosion in the bore, which greatly accelerates barrel "wear". So 500 rounds in 5 minutes is going to cause much more "wear" than would 500 rounds in 5 hours.

So depends on the rifle usage, the barrel material and finishes, barrel quality (ie precision), and what kind of life and usage you expect out of your barrel.

If you mag dumped 90 rounds though a high end service match stainless barrel, a competitive match shooter would likely consider it damaged if not ruined. If you mag dumped 90 rounds though a worn out chrome lined HBAR carbine barrel, a casual shooter would likely consider it just getting warmed up.


Very true.

Previous replies to this thread interpreted your question in terms of shooting it to destruction. However, if you are asking about sustained fire rate without DAMAGING your barrel, I recall the military uses a rate of 11 or 12 rounds per minute.


The TOP used for testing rifles and carbines is 1 round per second on semi, and 3 to 5 rounds every 5 seconds on auto.
nitrous406  [Member]
9/3/2012 5:29:01 PM
He is racking the ch because the mount that the rifle is attatched to blocks the bolt release.
Parrandero  [Member]
9/3/2012 5:35:14 PM
Originally Posted By evlblkwpnz:
16" 1/9 twist barrel is not milspec. It should be fine though with a Beta dump. I say raise hell with it and find its limit.


No AR-15 is "milspec".
AR_Tech  [Team Member]
9/3/2012 5:38:43 PM
Originally Posted By Parrandero:
Originally Posted By evlblkwpnz:
16" 1/9 twist barrel is not milspec. It should be fine though with a Beta dump. I say raise hell with it and find its limit.


No AR-15 is "milspec".


Maybe you don't understand what milspec is. It's a standard for parts interchangeability.
baxsom  [Member]
9/3/2012 5:40:19 PM
I have melted the gas tube on an A1 before when we had a few extra thousand rounds to burn off. replaced the tube after it all cooled down and it still gauged perfect and shot just as well as before.
tpelle  [Member]
9/3/2012 6:15:53 PM
From the USMC Web site

http://www.marines.com/operating-forces/equipment/weapons/m16

12 to 15 sustained rounds per minute.
FMJ  [Team Member]
9/3/2012 6:27:38 PM
Get a heavy barrel profile if you want to fire off several mags in short order..


Thats the reason why Colt made the M4 socom barrel.
GACKER1143  [Member]
9/3/2012 6:31:17 PM
http://codes.ohio.gov/orc/2923

Well I looked at this doesn't say crap about guns /magazines!
bassist  [Team Member]
9/3/2012 6:35:37 PM
Originally Posted By GACKER1143:
http://codes.ohio.gov/orc/2923

Well I looked at this doesn't say crap about guns /magazines!


Look closer, because I found it pretty dang quick. Any firearm adapted to fire more than 31 rounds (e.g. 30 in the mag and 1 in the chamber) is considered a machine gun in Ohio.
kappa9012  [Member]
9/3/2012 6:39:50 PM
is the slowing of the cyclic rate due to the gas escaping the gas tube??? All the discussion has been about the barrel, but are there any ill affects to the bolt and chamber? First video seemed to disprove chamber damage, but I noticed in both videos that weapons began to run considerably slower.
M16tackdriver  [Member]
9/3/2012 6:58:19 PM
Originally Posted By NotIssued:
does the guy in that second video not know he has a bolt release? Why does he keep racking the CH?


Because he's a freakin' idiot. Not only for not using the bolt release, but also for setting his rifle on fire.
M4Tank  [Member]
9/4/2012 10:54:42 AM
Originally Posted By M16tackdriver:
Originally Posted By NotIssued:
does the guy in that second video not know he has a bolt release? Why does he keep racking the CH?


Because he's a freakin' idiot. Not only for not using the bolt release, but also for setting his rifle on fire.


charging handle vs bolt release

I believe that second video is a military test...
Finslayer83  [Team Member]
9/4/2012 12:49:38 PM
Originally Posted By GardensandGuns:
Finally got my Ar-15 functioning. Used 16 inch chrome lined 1/9 twist barrel from ftf industies cerro forge. Stag Lower. Put 200 rounds through it over four hours at the range, rotating with my gsg and pistols. I would think that is nothing for an AR? How many rounds do you shoot when you are at the range? Can you empty a 100 round beta mag and what would be the effect to the rifle. Thanks


on average?

300-500 over a period of 2 hours
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