A Rebuttal to MG Scales “Gun Trouble” article in the Atlantlic

We’re generally admirers of retired US Army Major General Robert Scales. He was a fine combat officer, by most accounts, and a talented historian. What he isn’t is an expert on small arms.

Back on December 28th, Scales published a piece in the Atlantic titled “Gun Trouble” bemoaning the continued deployment of the M16/M4 series of rifles by the US military.

Any lost edge, however small, means death. A jammed weapon, an enemy too swift and elusive to be engaged with aimed fire, an enemy out of range yet capable of delivering a larger volume of return fire—any of these cancel out all the wonderfully superior and expensive American air- and sea-based weapons that may be fired in support of ground troops. A soldier in basic training is told that his rifle is his best friend and his ticket home. If the lives of so many depend on just the development of a $1,000, six-pound composite of steel and plastic, why can’t the richest country in the world give it to them?

The answer is both complex and simple. The M4, the standard carbine in use by the infantry today, is a lighter version of the M16 rifle that killed so many of the soldiers who carried it in Vietnam. (The M16 is still also in wide use today.) In the early morning of July 13, 2008, nine infantrymen died fighting off a Taliban attack at a combat outpost near the village of Wanat in Afghanistan’s Nuristan province. Some of the soldiers present later reported that in the midst of battle their rifles overheated and jammed. The Wanat story is reminiscent of experiences in Vietnam: in fact, other than a few cosmetic changes, the rifles from both wars are virtually the same. And the M4’s shorter barrel makes it less effective at long ranges than the older M16—an especially serious disadvantage in modern combat, which is increasingly taking place over long ranges.

Emphasis mine. Hold that thought, we’ll come back to it.


To be sure, the M16/M4 is not without its faults. But then, every small arms design is a compromise between several competing factors. It should be reasonably light, lethal (in terms of terminal ballistics), accurate both as a matter of internal ballistics and ergonomics, durable, easy to maintain, and easy to train with. Generally, improvements in one area tend to adversely effect another. Most obviously, light weight tends to reduce durability.

Retired LTC Craig Grosenheider pens a rebuttal to MG Scales at The Rhino Den:

What makes the evolved M16/AR15 series so effective that the Army’s Individual Carbine competition conducted in 2013 – evaluating 8 other competing designs under demanding conditions – concluded there was nothing to gain by replacing it? In addition to the 2013 evaluation, the M16 series has outlasted a nearly non-stop campaign to replace it with “leap ahead” rifle technology, from the flechette based Special Purpose Individual Weapon (SPIW) program in the 1960’s, to the Objective Individual Combat Weapon (OICW/XM8) program, effectively terminated in 2005, and has even survived the 2009 limited adoption of the Mk16/Mk17 Selective Combat Assault Rifle (SCAR), a purpose built modular weapons system painstakingly designed in full cooperation with downrange “operators” to specifically address requirements of USSOCOM. SOCOM fielded the 7.62mm SCAR-H / Mk17, but declined to adopt the 5.56mm variant because in their opinion it did not represent a significant improvement over the current M4A1 Carbine. Despite the option to use nearly any weapon they choose, when a SOCOM operator arrives on the objective today he’s more than likely carrying a 5.56mm M4 variant.

Read the whole thing.

As noted by Grosenheider, the Army has repeatedly attempted (and failed) to make a leap forward in small arms technology. That leaves marginal improvements on the table. Which, as Grosenheider shows, is just what the Army has been doing with the M16/M4 family since its introduction particularly in the past decade.

Let’s go back to MG Scales on the Battle of Wanat.

Some of the soldiers present later reported that in the midst of battle their rifles overheated and jammed.

Yes, that’s true. The fact is, no rifle lightweight enough for general issue can handle more than a certain sustained rate of fire. There’s a reason machine guns weigh more than rifles, after all.  And even the soldiers that fought there understand this. Via @WesleyMorgan on Twitter:

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“I love the M4. That’s why it angers me that they misquoted me they way they did. If you read in my sworn statement that says exactly the same thing that I stated here and which is the same thing that I keep saying but somehow they love to take out all the shrapnel pieces that I talked about and just made it sound like I’m talking bad on the M4 and the machine gun weapon system. It just angers me very, very much.”

Surveys of soldiers have consistently found them to be highly satisfied with the M4 carbine, indeed, moreso than any other small arm in the inventory.

The bottom line is that the M16/M4 is a satisfactory family of weapons, and the ultimate arbiter of whether soldiers will be successful with it is in training them to maintain and fire them properly.

The Army’s New(ish) Carbine

Nothing generates passion like discussing the Army’s primary weapon, the M4/M16 family of 5.56mm carbines and rifles. Virtually every gun related blog has long, long threads with suggestions for better weapons and demands for a different caliber.

But the Army has polled its troops repeatedly, and to some surprise, the troops are generally very happy with the M4. The have a great deal of confidence in the weapon, and they like it.

And let’s face it, absent some miraculous change in small arms technology, any change to a new weapons would be an incremental improvement at best.

But that doesn’t mean there isn’t room for modest improvement in the M4. The M4 carbine, a shortened, lightened version of the long-serving M16, was originally fielded two decades ago. It was never actually intended to be the primary weapon of the Infantry.* Instead, it was intended to equip soldiers that needed something more than a pistol, but for whom the length of an M16 would be awkward. Tankers, other armored vehicle crewmen and such.

But the handy little carbine was soon adopted by airborne and air assault infantry, for whom the weight savings were important. And the small size of the carbine made it popular with mechanized infantry as well, for the close confines of the troop compartment of their vehicles. And in Iraq, with close quarters combat inside the maze of buildings soldiers faced every day, the compact carbine was far easier to use than a full sized rifle. Eventually, the M4 ended up as the primary weapon for just about all ground combat troops.

One of the biggest complaints from the field was that the M4 used the same trigger group as the M16A2. It could fire semiautomatic, or it could fire a three round burst. But the burst feature was unpopular. Initially designed to save ammunition, it has some mechanical features that are annoying. If, when firing a first burst, you only hold the trigger long enough to fire one or two rounds, the next burst will not be a three round burst, but rather the two or one rounds not fired before. And the trigger pull required increases. Finally, while most of the time, suppressive fire should be in nice controlled bursts, there are times when longer bursts are needed.

And so, back in 2010 The Maneuver Center of Excellence (formerly the Infantry Center and School) requested that the Army switch to a fully automatic version of the M4. 

As it turns out, there is, and has for 20 years, been a fully automatic version of the M4. When the M4 was first designed, Special Forces and other special  operations entities liked the carbine very much, but insisted on a fully automatic version right from the start.

The M4A1, the fully automatic version, has a different trigger group, similar to the old M16A1 rifle that allows semiautomatic or fully automatic fire. Because of its potentially higher rate of fire, the M4A1 also has a somewhat heavier barrel, to better withstand the heat of firing.


While the Army is buying some newly built M4A1s, the majority of M4 carbines in Brigade Combat Teams will be modified to the M4A1 standard. Contact teams with conversion kits are travelling from the Army’s main small arms depot at Anniston, AL to various posts and modifying weapons one BCT at a time. Within a couple years, the process should be complete.





*Most Marine riflemen still carry long M16s.