I fully agree that a HBAR would take heat better.



When Colt did the M4 mag Dump until the barrel looked like a wet noodle . I wonder what condition the gas tube was in???
Seems it would of been fried as well??? I dont know??

I wonder how many Mags it takes to fubar a gas tube

Okay

the gas tube wont fail from 30rd mags because of the few seconds it has to cool between mags.

The problem with these tests is that if you have common sense, it'll tell you to cool the barrel off when you cant hold onto the handguard anymore from heat. Then you pour water, oil, or piss on it to cool it. This is why my M4 machine gun is sporting a socom barrel. I do carry enough mags to make the standard barrel fail and i'll use them as needed.  A suppressor heats the barrel faster also.

heres some pics of mine.

02/02 date stamp im running an arms #50M-CV freefloat forend. Its a pain to oil under the handguards but its more accurate FF. I got lucky and got my socom barrel free with the purchase of the m16 reciever. I dont know what the going rate is for the real colt socom barrels but auto weapons had one for sale at $1500



A7 I 2 marking on FSB


mine is a more traditional roll marking.




IMHO the barrel aint worth the extra weight unless its a MG.

Sometime in mid 94, I remember when Colt came down to Ft Campbell with two M4A1s.  Each SF guy that was there loaded up two 30 rd mags and fired those guns, semi and auto.  Guns started getting hot so gloves where worn and when they got too hot to hold we poured water from 5gal cans on them.  Shook off the water and back to shooting.  Some 30-40 SF guys put down range 4 cases of 5.56 (1680rds ea)as fast as we could.  We later got the M4A1 second qtr 95.  We didn't have a single malfunction that I remember.

CD

Nice weapon

I bought My first AR15 in 1983.
I ve shot AR15`s for awhile now.
So Im AWARE that fireing 30rdmags aint going to do a thing to a Gas tube If you shoot slow

The last  M4`  that I bought in 2005
I fired around  5000rds the first day to break in and to check how she runs.

My Question is How many Mag Dumps does it take to fubar a Gas Tube

Mag Dump-  Fireing alot of mags off fast

so how many mags would it take to melt the GAS tube? Fireing as fast as can be possible.
Or are you saying the SOCOM  barrel will fail before GT

WOW

Did they add any CLP durning there Fun time

only C-mags and other drums will melt the gastube, 30rd mags wont.

That I believe we did.  Every now or then give it a squirt into the action.

CD

do yourself a favor and buy arisol cans of hoppes #9 gunoil, I spray that stuff on hot barrels and MG's all the time. It even cleans that light rust/oxidation off that happens from overheating when its sprayed on the hot part.

CLP is crap, we ruined the finish on a few M4's, the barrels were permanently stained brown from it. I'll never use that smelly brown crap again

Info and video of M4 and M4A1 failure under sustained auto fire

http://atwar.blogs.nytimes.com/2010/01/12/m4-and-m4a1-guns/?hp

in that article it says the socom barrels gas tube ruptured at 900rds but the bolt was getting stuck to the rear in the video. Im almost positive the person who wrote the article just assumed the gas tube failed.

it looks like the bolt is getting stuck on the top round in the magazine, then he charges it and it loads. I have seen this happen on dry dirty weapons, spray some lube in it and I bet it runs a lot more.

Unfortunately, most of my data on the standard 14.5” Colt M4 barrels was lost due to a hard-drive crash.  However, the accuracy results were basically the same as those of the Colt 16” M4 profile barrels.  The M4/government profile barrels tend to show more variation in accuracy from barrel to barrel than the heavier profile barrels.

One such Colt 16” M4 profile barrel tested in the same manner as described in my original post of this thread produced three 10-shot groups from 100 yards that had extreme spreads of:

1.42”
1.19”
1.56”

for a 10-shot group average extreme spread of 1.39”.  The mean radius for the 30-shot composite group was 0.44”.


Another Colt 16” M4 profile barrel produced three 10-shot groups from 100 yards that had extreme spreads of:

1.59”
1.55”
1.73”

for a 10-shot group average extreme spread of 1.62”.  The mean radius of the 30-shot composite group was 0.54”.

Aimpoint QRP throw-lever mount with cantilever spacer.  They call it an absolute co-witness, but it is actually slightly higher.

I dont understand, the Thicker, 14.5" Socom barrel has a wee bit more accuracy than a 16" gov't or standard LE6920 barrel?