ACOGs making a difference for the Marines in Iraq

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Lumpy196

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Little scope making a big difference on the battlefield
Submitted by: 1st Marine Division
Story by Cpl. Paula M. Fitzgerald

ACOG1lr.jpg


CAMP BLUE DIAMOND, Iraq(April 20, 2004) -- The Marine rifleman is deadlier thanks to the Trijicon Advanced Combat Optic Gunsight.

Marines using the short scope mounted on top of their rifles are finding it easier to identify enemy fighters, aim in and kill them. They're doing it at longer distances with lethal fire through the haze of the battlefield.

Marines in the 1st Marine Division first started using the four-power scope last year in the invasion of Iraq. But it wasn't a last minute decision. Marines have tested the scope and its applications for almost two years.

According to Chief Warrant Officer 4 Chuck F. Colleton, the division's gunner, the Marine Corps was in the process of validating the need for designated marksmen within infantry units and looking for a precision-fired weapon to complement the marksmen.

"There were some Marines doing tests in Guam about the designated marksman concept," explained Colleton of Murrieta, Calif. "They were using M-16A4s and the ACOG. We did almost the same thing with 5th Marine Regiment at Camp Pendleton."

During the trials, Colleton said he was impressed with what he saw.

"We learned that the M-16A4 in conjunction with the ACOG could accomplish exactly what we needed on the battlefield," Colleton said.

In January and February 2003, the division issued a limited amount of ACOGs to the battalions.

"The Marines who had the ACOG during the war did amazing things," he said.

The ACOG proved its worth and the division ordered more for its next bout in Iraq.

The scope, which was designed specifically for the M-16 family, mounts to the rail system of the M-16A4 and is held in place by tightening knobs.

The 9.9-ounce scope is ideal for low-light situations thanks to a fiber optic light collector and tritium. This makes the reticle self-illuminating. Tritium is a radioactive gas used to provide nighttime illumination. This eliminated the need for batteries.

However, there is no extra night vision device available for the ACOG. Marines are currently adapting their PVS-14 night vision systems to the scope.

"We knew we had to have a scope that did not require batteries," Colleton said. "Some people think batteries are easy to come by, but anyone in a combat environment knows they are not."

The red, illuminated "chevron" inside the optic provides an aiming point for short-range targets, and the black bullet drop compensator helps shooters determine how far away targets are located.

The scope also magnifies targets four times what the human eye can see, which helps Marines pick out legitimate targets on the battlefield.

Lance Cpl. Kyle T. Mader, a designated marksman with Mobile Assault Company, 2nd Battalion, 4th Marine Regiment, already knows the advantages of using the ACOG.

During intense fighting in recent weeks, Mader and a handful of his peers put the optic to the test.

"There were times during the fighting that I couldn't tell with my eyes if a guy had a weapon or not," said Mader, of Shoreview, Minn. "I looked through my ACOG and could see if he was carrying a weapon or not."

Mader recalled a time when he was receiving enemy fire but could not tell where the rounds were coming. With his eyes alone, he saw a man more than 800 yards in front of him but did not know if the man was carrying a rifle. Using the ACOG, Mader could see an AK-47 in the man's hands, so the Marine immediately eradicated the threat.

Colleton said Marines do not target unarmed civilians, and the last thing any Marine wants to do is kill an innocent person.

"The ACOG allows the Marines to identify a person as a friend or a foe," the gunner said. "Instead of firing into a crowd of people without knowing where the enemy is, the Marines can locate that target."

This also reduces the amount of ammunition Marines need because they are able to aim in on specific targets rather than spraying the area with rounds.

"The key to the ACOG is that shooters can see where they are impacting if they miss," Colleton explained. "The shooters will be able to see the dust or rocks fly up if they miss; then they can adjust quickly and get on target."

The ACOG, made of durable forged aluminum, was also designed to be used with both eyes open, providing extra protection to the shooters.

"The dominant eye focuses in on the target while the other eye gives you a wider field of view," Mader explained. "It really helps in a firefight because you can still keep an eye on what is going on around you."

Cpl. Cody H. Adams, infantryman with Company E, 2nd Battalion, 4th Marine Regiment, also likes being able to use both eyes to shoot.

"It's great being able to take out the enemy while being able to protect yourself," said the Boscobel, Wis., Marine. "It's definitely an advantage in combat."

With all the advantages, the Marines would like to see more of their brothers-in-arms receive the scope. Plans call for every battalion to be equipped with at least 250 ACOGs by the end of May.

Editor's Note:

The following specifications are provided for graphic information.

INFORMATION BOX

Name: Trijicon Advanced Combat Optic Gunsight
Magnification: 4X
Objective lens (mm): 32
Eye relief (inches): 1.5
Exit pupil (mm): 8
Field of view (degrees): 7.0
Weight (ounces): 9.9
Length: 5.8 inches
Field of view (@100 yards): 36.8
Adjustment (click/inches @ 100 yards): 3

Source: www.trijicon-inc.com
 
Mader recalled a time when he was receiving enemy fire but could not tell where the rounds were coming. With his eyes alone, he saw a man more than 800 yards in front of him but did not know if the man was carrying a rifle. Using the ACOG, Mader could see an AK-47 in the man's hands, so the Marine immediately eradicated the threat.

Probable took more than one round to take the guy out, but the M855 round is still pretty accurate. I'm assuming it was the M855....
 
The newer M16A4s are probably still shooting as well as they were when they came out of the box, so about 2" at 100 yards. All things being equal, thats about 16" at 800 yards. I'm guessing multiple torso hits or a couple of shots at the melon (to make up for loss of accuracy).
 
30 Cal, you're flat out incorrect.

This is pretty accurate ballistic info on what my 62gr SCBT reloads do out of my Mini 14 (that is zeroed at 200yds).

Range Velocity :

(yards) (ft/sec) (ft-lbs)
0 3106.8 1328.7
100 2907.9 1164.0
200 2717.6 1016.7
300 2535.6 885.1
400 2361.4 767.6
500 2194.7 663.0
600 2033.9 569.5
700 1880.4 486.7
800 1734.9 414.4


1734.9FPS is just barely under a 22MAG at 50yds.


Some of the guys over there are also shooting 75gr Match ammo.
 
I figured we were talking about standard issue ammo--M855 which is transsonic at about 800yds. The 75gr's aren't much better (I just pulled the black hills 75 HPBTM table).
 
The M16A4 is a 20inch barrel, right?

My reloads are all 26.1gr WC844 with an IMI 62gr SCBT and that is the GI SPEC M855 round.
 
The newer M16A4s are probably still shooting as well as they were when they came out of the box, so about 2" at 100 yards. All things being equal, thats about 16" at 800 yards.

The Marine probably could take his time...what's the drop on 7.62x39 like at that distance? Probably have to hold on the roof of the house the person is standing next to. :)

I thought most M16s could group better than 2 MOA.

Also, 2 inches at 100 yards does not, in general, translate to 16 inches at 800 yards.
 
I thought most M16s could group better than 2 MOA.


M16s aren't commercial heavy barreled AR clones. They're lighter-barreled rifles that have been used, abused, and probably cleaned from the muzzle quite a bit.

A standard M16 isn't "match grade"; if it was, it would be less reliable. Match grade parts break, and don't work when dirty.
 
M14s have been used (more by the Army than Marines, I think) but M16s have been pressed into the role, too. The US military doesn't really have a "standard" DMR equivalent in availability and function to, say, the Russian SVD Dragunov.
 
I think the 75 could be pushed hard enough to be supersonic at that distance, but even if not, who cares? Guys are pushing 80's and 90's supersonic at 1000. Whackin bad guys is all that matters. If you're on the receiving side of daily ambushes, a few minutes of making the bad guy scream while you put another round in him is usually all the better.

FWIW, I think some of those guys DO have some match barrels out there.
 
The Squad Advanced Marksman Rifle does have a stainless match barrel as well as a KAC free float forearm & flip up sights, but it is not nearly as common as the M16A4/M5 RAS/TA31F ACOG combo. The SAM-R is an individually built rifle.

124263.jpg
 
and probably cleaned from the muzzle quite a bit.
From the muzzle exclusively and with the crappy sectioned cleaning rod. Also, having been in the postion myself, they probably clean them far more than is necessary (a gray Q-tip gets you sent back to square one).

At any rate, it is good to hear that Marines are getting some more quality kit...and using it.
 
The M16A4 is a 20inch barrel, right?

My reloads are all 26.1gr WC844 with an IMI 62gr SCBT and that is the GI SPEC M855 round.

I'm pretty sure it's 20". I just plugged the numbers that I grabbed off the web(.223, 62grs, 3100fps, BC=0.304) into my Sierra program. It looks like you and I are using different BC's.
 
Yes, the M16A4 has the same barrel length and profile as the M16A2 barrel. 20" chrome lined 1/7 twist, light under the handguards.
 
I understand that the barrel is lighter under the hanguards, but what is the point of having it heavier after the sight block? Does the limited amount of barrel that is the 'HBAR' type make a difference in cooling?
 
I have no idea why the M16A2's barrel is like it is. I have no idea why the M16 barrel was ever made heavier than the A1s, and I have no idea why civvie manufacturers don't make 20" AR-15 pattern rifles with anything but heavy barrels.

*Shrug*
 
My guess would be either for heat-related issues or muzzle whip.

If you look at JP Enterprises competition barrels, they are larger from the gas port to the muzzle also. They said they tried a wide variety of barrel profiles and found that one most accurate.

The A2-A4 profile is similar, but obviously scaled narrower throughout.

-z
 
...and I have no idea why civvie manufacturers don't make 20" AR-15 pattern rifles with anything but heavy barrels.

I'm a fan of the "lighter" barrels myself.

With that being said, I'll go out on a limb to say that it takes less resources to turn a heavy barrel than it does a pencil barrel.

Name it HBAR and civvies like me buy into it.

My measly tax-payer paid $0.02.

Jim
 
Wow. Interesting article.
Nice to see that the Marine Corps. chose the same ACOG as I did. And are happy and successful with it.
I am not sure about cleaning from the muzzle. I never cleaned my M16 from the muzzle when I was in. We were taught in basic to clean from the breech end. I never say anyone cleaning from the muzzle. The Marine Corps. has a reputation for taking their rifle marksmanship very seriously, I would be surprised to find out that they were cleaning from the muzzle.
 
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