Modern Firearms - Assault Rifles
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Is there a thing such as an Assault or Battle rifle?

 

Text by Maxim Popenker, © 2014

 

The term “Assault rifle”, despite its widespread use, is controversial, mostly because there’s no single agreed definition for it.

It first became well-known during and shortly after WW2 as a political/propaganda measure on the part of Adolph Hitler, although both the basic concept and the term itself have a noticeably longer history.

The earliest use of a similar term, known to this author, is dated back to the 1918-1920 timeframe, when noted US small arms designer Isaac Lewis designed a series of experimental automatic rifles which he called “Assault phase rifles”. These rifles fired standard US Army issue rifle ammunition of the period, the .30 M1906 (.30-06, 7.62x63mm), and were in direct competition with John Browning’s M1918 BAR automatic rifle. Both Lewis and Browning automatic rifles were designed to same concept of “Walking fire”, originated by the French in around 1915, and first implemented in the ill-fated CSRG M1915 “Chauchat” machine rifle. This concept called for a man-portable automatic weapon with its primary use being to provide suppressive supporting fire for infantry during assaults on entrenched enemy positions. In fact, this concept called for THE “Assault” rifle, but its early implementations, such as CSRG M1915 and BAR M1918 mentioned before, or the Russian Fedorov M1916, had some inherent flaws.

 


Browning BAR 1918 automatic rifle in its original assault / walking fire role

 


Experimental "assault phase rifle" by Isaac Lewis, developed circa 1918 to compete with BAR M1918. It fired same powerful .30 M1906 (.30-06) rifle ammunition

 

The major source of problems with these “first generation” “assault” rifles was its rifle ammunition. Designed during the late 19th and early 20th century, it was quite powerful, with a long range, necessary for suppressive long range volley fire; a standard and widespread infantry practice until the mass adoption of machine guns during WW1. This “extra power” resulted in significant recoil, as well as a noticeable weight of the ammunition and of the rifles that fired it, increasing manufacturing and logistic costs and making such automatic rifles harder to use in combat.

 

The most logical solution to this problem was to reduce the power of rifle ammunition to the level necessary for most (but not all) typical combat scenarios. Traditional rifle cartridges of the era had a “lethal range” well in excess of two kilometers; however, under combat conditions no one (well, almost no one, but more on this later)  can expect an average soldier to be able to hit a man-sized target at ranges longer than 300-500 meters. Furthermore, decreasing the power of rifle ammunition has several benefits. These include: savings on raw materials, powder, logistic costs per round; increased combat load (in number of rounds carried) per soldier; decreased weight, size and cost of rifles; decreased recoil, which is conductive to increased accuracy; and a few others.

This concept was supported by practical experience gained during the Great War with the French-issued US-made Winchester M1907 self-loading rifles. These handy carbines were initially bought from the USA by the French army to arm aircraft observers, but machine guns soon replaced rifles in this role. On the other hand, compact and handy carbines that fired a good “stopper” cartridge (.351 WSL, also known as 9x35SR, with round-nosed bullets) were excellent weapons for close combat on battlefield. Fitted with extended magazines (15- or 20-round capacity), bayonet mount, and, in some cases, converted to fire in full-auto, these little rifles became progenitors of the modern “assault rifle” concept, which is, in basic terms, an automatic carbine firing reduced-power ammunition. This reduced-power ammunition is also known as intermediate power ammunition (or simply “intermediate cartridges”), as it is less powerful than standard military rifle ammo but more powerful than typical handgun ammo.


Winchester M1907 carbine in "assault" configuration (as used in WW1 by French army) and its .351WSL "intermediate power" round

 

As early as 1918, several countries began to work along the lines of this “reduced power” concept, including France and the USA. The French attempt was the Ribeyrolles M1918 automatic carbine which fired specially designed 8x35SR ammo, based on the .351WSL cartridge but modified to accept standard 8mm Lebel pointed military bullets. The American attempt, known as the Winchester-Burton machine rifle, also used a cartridge based on the .351WSL. This purpose-designed round was called .345WMR (Winchester Machine Rifle), and used a pointed bullet of approximately 9mm caliber.
During the early 1920s, Switzerland and Italy joined the club of “intermediate power” developers, producing their own cartridges and automatic or semi-automatic weapons to fire them. By mid-1930s several other countries (e.g. Denmark and Germany) attempted to develop their own versions of intermediate power cartridges and automatic weapons to fire them, but none was ever adopted.


Ribeyrolles M1918 automatic carbine with its 8x35SR cartridge

Winchester-Burton machine rifle with .345WMR cartridge. This unusual weapon has two top-mounted magazines in V-shaped configuration.

 

And here’s the big question: if the concept was known and found worth researching as early as 1918, why it was not fielded until 1942? There’s no simple answer, but we can speculate to provide some reasons, as follows:
1) the military, especially the top ranking military personnel, is by nature quite conservative. And the very concept of arming every infantryman with a rifle capable of firing a full combat load of 100 rounds in about a minute was alien to many commanders who grew up during the era of bolt action rifles with magazine cut-offs.
2) despite weight and cost savings “round per round”, offered by intermediate cartridges compared with standard rifle rounds, greatly increased expenditure of smaller rounds in full-automatic weapons would still put additional strain on manufacturing and logistic capabilities, not to mention budgets, which were drastically cut back after the end of WW1.
3) after WW1 machine guns were considered to be essential infantry arms, and using reducing power ammunition in machine guns was out of the question at the time. Therefore, this would require keeping two different rounds in the supply chain, making logistics even more complicated.
4) up until the mid- or late 1930s, typical targets for infantry rifle fire included, besides enemy personnel, other battlefield objects, such as horses (cavalry was still considered important by many nations), armored cars and low-flying combat aircraft. All of those targets are tougher than an average human being, and using reduced power ammunition against these types of targets would place troops at an obvious disadvantage.

 

Overall, it appears that most militaries of the interwar period considered the “full power” semi-automatic rifle as a next logical step in the evolution of the individual infantry weapons. Some nations tried to create automatic rifles (such as the Soviets with their unsuccessful AVS-36 rifle), but the majority was set on the self-loading only types. One notable attempt to reduce the power of the standard infantry rifle was made by the Americans during the late 1920s - early 1930s, when they tried to replace the old and powerful .30-06 (7.62x63) cartridge with a .276 (7x51) cartridge, developed specifically for new semi-automatic military rifles. This attempt was cancelled, though, mostly on financial and logistic grounds.

 

Despite all these reasons not to adopt reduced power automatic rifles, military experts and industry engineers kept working on the new concept. Among these were the Germans, who took the intermediate cartridge route in 1935. By 1940 the Department of Armaments, German Army (Heereswaffenamt, or HWaA in short), had settled on the 7.92x33 intermediate power rifle cartridge, developed by the Polte company. From the performance point of view, the nominal caliber of 7.9mm was inferior to the originally proposed 7mm caliber, but 7.9mm was chosen for its manufacturing benefits, as new barrels, cases and bullets could be made on existing machinery, originally used to produce barrels and ammunition for standard infantry 7.92x57 Mauser cartridge.

 

The 7.92x33 round, also known as the 7.92 Kurz (short), fired an 8 gram bullet at about 690 m/s, with muzzle energy of about 1900 Joules. Compared with the 7.92x57 Mauser with a standard sS bullet (12.8 gram at 800 m/s, 4100+ Joules), this new “Kurz” cartridge generated about 50% less recoil and also weighed about 40% less (16.7 g as compared to 26.9 g). Once this promising new round was selected, contracts were issued to the Haenel and Walther companies to develop a new class of automatic weapons – so called “machine carbines”, or Machinenkarbiner in German (MKb in short). By 1942, two versions of the German MKb.42 machine carbines (MKb.42(H) by Haenel and MKb.42(W) by Walther) were tested at the Western front, and the concept was found to have its merits. However, official adoption was delayed by troops requesting some changes (including conversion to fire from a closed bolt as opposed to the original “submachine gun style” open bolt firing), and, more important, by personal orders from Adolf Hitler to cease all development of new classes of small arms. To circumvent Hitler’s orders, the next version of the Machinenkarabiner was renamed to Maschinenpistole (submachine gun, a class of weapons already in widespread service with German army), and entered production in 1943 as the MP-43. Once reports of the MP-43 success at the front reached German Headquarters in 1944, Hitler finally approved mass production of the new weapon and its associated 7.92mm Kurz cartridge, personally christening it “Das Sturmgewehr 44” (Stg.44 in short), which means “Storm” or “Assault” rifle. It was pure propaganda, as at the time Hitler’s’ Germany was all about defense instead of the earlier “Sturm und Drang” attitude. Overall, about 425,000 Sturmgewehr rifles were made for the Wehrmacht before the war ended, and it made a sufficient impression on allied forces to warrant very close examination.


German soldier with MKb.42(H) automatic carbine, WW2

 

At the same time (1939-40) the American army issued a request for the development of a “lightweight rifle”, a handy .30 caliber (7.62mm) automatic carbine, with the intention of using it as a more effective replacement for the military pistol. The cartridge developed for this weapon by the Winchester Company, was based on the .32WSL hunting round, and fired a 7 gram bullet at a muzzle velocity of about 600 m/s (muzzle energy 1,300 Joules). Loaded with a round-nosed bullet, it looked more like stretched pistol round than a downscaled rifle round, but it was about twice as powerful as most contemporary military pistol rounds. Shortly after the start of trials the US Army dropped the “full auto” requirement, and the actual M1 carbine, adopted in 1941, was a semi-automatic only weapon. Despite its original concept of “Personal Defense Weapon” being exactly opposite to that of “Assault rifle”, the M1 carbine quickly became popular among fighting troops for its handiness, maneuverability and rapidity of fire. By 1944, it became apparent that a full-automatic version of the M1 would make sense for front-line troops, and the selective-fire M2 carbine was approved for service and put into production toward the end of the war. By modern ballistic standards, it may fall short of being a “true assault rifle”, but, nonetheless, it was an important historical weapon which deserves honorable mention at the very least.

 

It must be noted that the evaluation of wartime lessons brought different practical results. The Soviet Union, whose army learned the value of massed automatic fire through the widespread issuing of submachine guns, took the intermediate cartridge concept to heart and after a series of trials, in 1949 adopted the world’s most successful “reduced power automatic carbine”, the Kalashnikov Avtomat or AK in short, known to the West as the AK-47. In official Russian terminology, “Avtomat” means “automatic”, and historically this term was used to describe all sorts of hand-held individual automatic weapons, from the full-power Fedorov rifle of 1916, to a series of WW2 era submachine guns (i.e. the PPSh-41 submachine gun was also known officially as “Avtomat obraztsa 1941 goda” or “automatic weapon, 1941 pattern”). The term “assault rifle” or its Russian equivalent never really caught on here.

 

Some western countries also attempted to develop a “reduced power” cartridge. Most notable of these was so called “BBC committee” (Britain – Belgium – Canada), which promoted a .280 caliber (7x43mm) intermediate cartridge of British design. However, this concept met with little interest in USA, where idea of an accurate long-range (up to 1000 yards / 911 meters) infantry rifle was heavily ingrained into the mindset of the top-ranking officers who made procurement decisions. As a result, the US Army adopted a slightly shorter and lighter .30 caliber cartridge, which, nonetheless, possessed the same ballistic properties (bullet weight, muzzle velocity, energy and, most important, recoil impulse) as the old .30-06 M2 round. Known as the 7.62x51mm NATO, this round was then forced upon all other NATO members, effectively killing development of “reduced power” ammunition and weapons in the West for some time.

 

Here we must stop again and re-evaluate the term “Assault rifle”. It was officially used to name several weapons in various countries after the WW2. First of these post-war “Sturmgewehr” rifles were Swiss Stgw.57 (also known as SIG 510, caliber 7.5x55) and Austrian Stg.58 (License-built Belgian FN FAL, caliber 7.62x51), both being selective-fire rifles firing full-power ammunition. Probably the most ironic fact about these “Assault rifles” is that both Austria and Switzerland are neutral countries and their weapons serve primarily in the defensive role. In most English-speaking countries new weapons were (and still are) designated simply as “Rifle” (i.e. “Rifle, 7.62mm L1A1”, or “Rifle, 7.62mm M14”), without mentioning any specific role, be that assault, defense or anything else.
Now we see that second generation of “assault rifles”, spawned by Stg.44, was in fact split into two groups – one firing “intermediate” ammunition, such as German Stg.44, Soviet AK-47 or Czechoslovak SA Vz.58, and another, firing full-power ammunition, such as American M14 and Ar10, Belgian FN FAL, German G3 or Swiss Stg.57.

 

Therefore we must admit that “Assault weapon” is an artificial moniker which offers little of value compared to more generic “automatic rifle” and “automatic carbine” terms. In some cases it is used to specifically separate “intermediate power” automatic rifles from their “full power” cousins (which also has their own class name “battle rifles”, equally pointless), but its actual historical use proves that it’s not the case. Possibly the most correct designation for “reduced” or “intermediate” power automatic rifle from technical standpoint is the original German term “Maschinenkarabiner” or its English equivalents “Machine carbine” or “Automatic carbine”, because “carbine” in general means “short and light rifle”. The Russian term “Avtomat” in its modern sense is appropriately and officially defined in as “automatic carbine” as well. Despite that, the term “Assault rifle” however misleading it is, has certain gravitas, is in widespread use and, let’s accept it, sounds just cool, so, most probably, it still will be widely used to describe automatic carbines and rifles despite all facts pointed out above. Same applies to the “battle rifle” term, which is often used to describe modern “full power” automatic rifles such as M14, AR10, HK G3 or FN SCAR-H. In fact, there’s no significant tactical or ballistic difference between old 7,62x54R AVS-36, AVT-40 or FG-42 automatic rifles of WW2 era and most modern 7.62x51 automatic “battle” rifles.

 

Now let’s get back to the history of automatic rifles. As we noted before, the East (USSR and its satellite states) by early fifties began to arm their infantry with intermediate-cartridge weapons (automatic and semi-automatic carbines, as well as light machine guns). Full-power rifle cartridges were kept mostly for platoon-level medium machine guns, as well as for sniper rifles. West (NATO and many other countries) went the “full-power” road with adoption of the 7.62x51 NATO round, developed in USA. Despite all stubborn efforts of US Army to prove that its choice of new round was the right one, practice of the time proved that it was not the case. Full-automatic fire from newly designed 7.62mm NATO rifles was ineffective to say the least, and many countries either adopted new rifles as semi-automatic from the start (like UK did with their L1A1 SLR), or later converted most selective fire rifles to semi-auto only (as US Army did with their own M14 rifles). And in semi-automatic fire, long range potential of the 7.62mm NATO round was basically lost due to limitations of the iron sights and Mk.1 eyeballs of typical infantrymen. In parallel, a lot of research was done to find ways to improve effectiveness of infantry fire. Not surprisingly, this research pointed out what was already known by 1918 – capabilities of average soldier in a typical combat situation limit effective rifle fire to 300-400 meters maximum. This “old” finding, along with the new concept of the “salvo” firing (to achieve hit-spreading “shotgun effect”, which could compensate for slight aiming errors) resulted in decision to decrease caliber of infantry weapon from typical 7-8mm down to about 5-6mm or less. This decrease offers several advantages compared to “standard caliber reduced power” ammunition, including faster bullets with flatter short- to medium-range trajectories, decreased weight of ammunition and guns, and reduced recoil. Several ambitious but largely unsuccessful programs centered on subcaliber flechette rounds, multi-bullet rounds, micro-caliber bullets (4mm and below) and caseless ammunition were conducted in USA, Germany and elsewhere, but practical results were achieved only with conventional ammunition of .22” caliber (5.56mm), developed in USA during late fifties with conjunction of the Armalite AR-15 / Colt M16 rifle. This brought to life what could be called a “third generation of assault rifles”, however artificial this distinction is in reality. Technically, these “third generation” weapons were selective-fired automatic rifles or carbines, firing reduced power, reduced caliber ammunition. Inspired by developments in USA, by late seventies – early eighties this concept caught on both in West (with adoption of improved version of American 5.56mm cartridge as a next NATO standard rifle ammunition in 1979) and in the East (with Soviet Army adopting its own version of the small-bore reduced power cartridge in the form of the 5.45x39 round in 1974 along with AK-74 rifle).


Vietnam war was the first major conflict where both sides used intermediate power automatic rifles ("assault" rifles), such as Soviet Kalashnikov AK and AKM (above) and American M16 (right)

 

Today, forty or so years later, most armies of the world still use this “third generation” rifle ammunition (reduced power, reduced caliber) for standard infantry rifles and squad support weapons. Basically, rifles designed in 2014 are not much different from rifles designed in 1964 or so, except for some more modern materials and finishes. And that’s because they all fire the same ammunition. Limited success of the so-called bullpup configuration rifles also does not add much to overall combat capabilities of the rifle-armed soldiers, not to mention the fact that bullpup automatic rifles were designed and tested during development and evolution of 1st and 2nd generations of individual automatic rifles.


Another modern trend is an attempt to bridge the gap between full-power, standard caliber and reduced-power, reduced caliber ammunition with introduction of some “more powerful than intermediate” rounds such as 6.5 Grendel or 6.8 Remington SPC. These rounds are surprisingly close in basic ballistic properties to century-plus old warhorses such as 6.5x50SR Arisaka, except that modern rounds have shorter and lighter cases (thanks to improvements in propellant chemistry) and bullets with better shape. Therefore, in terms of overall performance any modern 6.5mm – 6.8mm “assault rifle” is not that far from 1916-vintage Fedorov Avtomat, which fired 6.5mm Arisaka ammunition. The most notable differences between modern and century-old guns would be materials, manufacturing techniques and overall reliability, especially in harsh and adverse environment conditions. The key factor that allows moderns soldiers to be noticeably more effective in terms of hit probability is, in fact, not the rifle or ammunition but sighting equipment. Modern telescopic day- and night sights greatly enhance shooter performance at medium and long distances, and red-dot sights bring short-range performance under dynamic conditions to a whole new level, compared to old-style iron sights. However, in most cases those sights are not unique to any given weapon, and, in theory, anyone with access to a near-century-old weapon such as BAR 1918 or Fedorov 1916 could outfit it with modern sights with some minor gunsmithing.

 

One interesting recent trend is a slow but noticeable comeback of the full-power automatic rifles firing 7.62x51 NATO ammunition. For some time these rifles were issued mostly in semi-automatic, designated marksmen versions, with intent to increase reach of small infantry units armed with 5.56mm weapons in desert or mountainous terrains. However, it appears that one such rifle per squad is often not sufficient to fight enemies who are using distance, natural cover and modern body armor for protection against small arms fire. Therefore, several companies worldwide now offer 7.62mm automatic rifles which are intended for individual, rather than squad-support use. To name a few, there’s FN SCAR-H from Belgium, HK 417 from Germany, SIG 716 and 751 SAPR from international SIGARMS Company. Most of these weapons are intended for Special Forces, but in May, 2014, Turkish army, which by the way is the biggest NATO military force in Europe, announced its adoption of the MKEK MPT-76 rifle, which appears to be a general issue, select-fire weapon based on the German HK 417. Turkish army has plenty of actual combat experience with three most widespread infantry rifle cartridges of today – 5.56x45 NATO (in license-built HK 33 rifles), 7.62x39 (in imported Kalashnikov AKM rifles) and 7.62x51 NATO (in license-built HK G3 rifles). And it seems that Turkish infantry can put up with decreased ammunition capacity in hopes to get more effective and far-reaching weapon. With these weapons, automatic fire is reserved for rare, but still probable situations such as ambushes or CQB, and most shooting is to be made in deliberate, aimed semi-automatic fire.


US Navy SEAL demonstrates his FN SCAR-H Mk.17 automatic rifle, chambered for full-power 7.62x51 NATO ammunition

 

Back to square one? In a sense – yes, because, as we’ve seen above, in terms of ballistics those most modern weapons are very close to first-generation weapons dating back to WW1. However, rapid evolution of sighting equipment, with low-power telescope sights and red dot (collimating) sights, and especially with emerging class of electronic sights with built-in ballistic computers and other digital sighting aids, helps to stretch the envelope of effective small arms fire beyond practical capabilities of intermediate-power ammunition.

 

Final note

There’s another misleading term in circulation in USA, the infamous “Assault weapon”. This has no technical or tactical definition whatsoever, but is used as a label to mark whatever weapon is not liked by certain US politicians in an attempt to make this weapon to look “evil” and to ban it from civilian sales and ownership. In tactical sense, almost any weapon, from stone or wooden club through flintlock pistol to modern semi- or even full-automatic rifle can be used as weapon of assault, as well as “weapon of defense”, “weapon of sport shooting or hunting” etc.