Those of us who appreciate the finer points of firearms have passionate arguments about what (if any) rifle should be adopted to replace the M-16 currently in service with our armed forces. It's much like arguing which sports car is the best, or which woman is the most attractive: everybody has his own opinion.
The Army has been attempting to develop a replacement for the M-16 for several years. Part of the reason is that the M-16 has been in service now for forty years, and advancements in materials and ammunition design all but guarantee that a materially superior weapon can be built. The German firm of Heckler and Koch developed the XM-8, a derivative of their G-36, for evaluation by the Army. It is my understanding that the Army made last-minute changes and may either reopen the development and bidding process (in which case the American-made Robinson Arms XCR may get a shot at the contract), or may scrap the project entirely. In any event, the service rifle that replaces the M-16 should have the following characteristics:
1. The rifle should be quick and inexpensive to manufacture.
In 1917, the service rifle was the magnificent M-1903 Springfield rifle. Unfortunately, the Springfield and Rock Island Arsenals could not make these complicated rifles fast enough to equip the huge number of soldiers we were sending to France, and so the Army had to use a second type of rifle, the M-1917 Enfield, purchased from civilian contractors. We don't need the possibility of a similar situation arising again.
2. The rifle should be easy to use and maintain.
The M-16 is quite easy to use. The only flaw in its design is that it is not designed for left-handed firers: both the selector lever and magazine release are designed with right-handed firers in mind. Ambidextrous controls are highly desirable.
The charging handle should be placed so that it can be operated without removing the rifle from the shoulder. It should be ambidextrous.
The rifle must have a chrome-lined bore and chamber, or otherwise be constructed of corrosion-resistant material.
The M-16 is a maintenance-intensive rifle, however. This is a result of its 'direct impingement' gas system, which vents gas from the burning propellant directly into the bolt carrier.(1) A cleaner, more reliable gas piston system should be used.
Small, easily-lost parts that must be removed to field strip and clean the rifle are absolutely undesirable. The M-16 bolt assembly has several small parts (such as the firing pin retention pin) that are VERY easy to lose.
3. The rifle should fire a cartridge between 6 and 7mm, with a bullet weight between 100 and 140 grains.
The current M-855 ball cartridge for the M-16 fires a 5.56mm bullet weighing 63 grains. As many others have pointed out, this is considered a 'varmint' cartridge by American hunters and insufficient to reliably kill deer. Soldiers in Iraq and Afghanistan have found that the small bullet does not reliably stop enemy combatants.
The Army, in conjunction with Remington Arms, has developed a new cartridge, the 6.8mm SPC. This fires a much heavier 115 grain bullet that matches the ballistics of the older 7.62mm NATO round quite well out to 500 meters. Apparently, some Special Forces troops have used the new cartridge in Afghanistan and are quite satisfied with it. Barrett Arms has developed a replacement upper receiver for the M-16 that can allow easy conversion of existing rifles to the new cartridge. They also replaced the dirty M-16 gas system with a (presumably) cleaner piston system.
There are those those who would like to see the Army use the older 7.62mm NATO cartridge as the standard for both our service rifles and machineguns. I am not among that number. While the 7.62 round is excellent in terms of power and accuracy, it is too large and heavy to be a good service rifle round. Why reduce the number of rounds a soldier can easily carry AND saddle him with a rifle that has a hefty recoil?
4. The rifle should function reliably in all extremes of heat, cold, humidity, dust, dirt, etc.
In his autobiography About Face, Col. David Hackworth describes how a dead NVA soldier with his AK-47 was exhumed while Hackworth's battalion was building a firebase in the sodden Delta region of South Vietnam. Though the rifle had been buried in muck, Hackworth was able to charge it and fire a full magazine without any cleaning. Now THAT'S reliability.
The current M-16 is quite reliable provided that soldiers keep it clean. However, the magazine design is considered marginal.(2)
5. The rifle should weight less than 7 lbs. with a full magazine.
The M-16 weighs about 8.8 lbs. with a full magazine; the M-4 weighs about 7.5 lbs. with a full magazine.
6. The rifle should be able to mount a bayonet and be rugged enough to serve as a melee weapon.
I would prefer a slightly heavier rifle that can be used as a club over a lighter rifle that will break if so used.
7. The rifle should be capable of selective fire (semi-auto / burst / full automatic).
The orginal M-16 was capable of full automatic fire. The Army found during the Vietnam War that soldiers would often panic and empty their entire magazine in one long burst. Hence, the M-16A2 was designed with a three-round burst limiter.
In general, it seems to me that fully auto fire should be provided only by machineguns; the purpose of the rifle is precision fire. However, there may well be cases when a soldier needs a very high volume of fire to suppress the enemy, and so full auto capability is useful. If the rifle is to be capable of conversion to a squad automatic weapon, full auto capability it required.
8. The rifle should have provisions for easily attaching various accessories such as a grenade launcher, laser sight, flashlight, etc.
9. The rifle should feed from a rugged, reliable detachable box magazine that can be quickly reloaded using chargers (aka 'stripper clips').
Ideally, the rifle should have integral feed lips such as in the M-1941 Johnson automatic rifle. This greatly reduces the possibility of feeding problems due to damaged or bent magazine feed lips. The magazine should hold a minimum of 25 rounds of ammunition and feed reliably when fully loaded.
10. The ejection port should be designed / positioned such that cases are not deflected toward the firer, yet should also be easy for the firer to inspect when taking immediate action to clear a malfunction.
The M-16A2 has a brass deflector just behind the ejection port to prevent cases from being flung in the face of left-handed shooters. The Steyr AUG rifle can be configured to eject from both sides of the receiver. Either system is acceptable.
11. The rifle should be fitted with an optical sight with back-up iron sights.
This is quite controversial. I personally believe that optical sights are too delicate for field use, but troops are using them in Iraq and Afghanistan, so perhaps I'm just behind the times. The Army also found during development of the XM-8 that soldiers have a much higher first-round-hit probability with optical sights than with traditional iron sights.
The sight should also have some provision for night firing (such as an illuminated reticle).
12. The rifle should be able to serve as a squad automatic weapon with simple modifications.
This includes the ability to rapidly change the barrel with no special tools, and the ability to feed from a very large capacity magazine. While it would be HIGHLY desireable that the rifle could feed from belts, this would almost certainly make it too complicated (and thus expensive and prone to malfunction).
13. The rifle should be fitted with an adjustable butt stock.
This allows soldiers of different heights to adjust the length of pull, making the rifle easier to shoot.
Other notes:
- The best is the enemy of the good. The primary objective is to place in the hands of the soldier a rifle that is more reliable and effective than the M-16. Any feature that detracts from meeting this goal should be dropped.
- The quick-change barrel and buttstock of the XM-8 are great ideas, allowing the rifle to be easily tailored to a variety of missions. If possible, the new service rifle should incorporate these features.
- The AUG and the British SA-80 are bullpup weapons, and several other nations have adopted this configuration for their rifles. However, I have heard that placing so much of the rifle's weight so far to the rear exacerbates muzzle climb during rapid or automatic fire. If so, then this is not a good design feature even though it makes the rifle shorter.
- While compatibility of ammunition with NATO is highly desirable, this should not deter us from removing the 5.56mm round from service.
- The rifle must be easy to decontaminate in an NBC environment. Hence, exterior surfaces must be able to withstand contact with harsh decontamination chemicals.
(1) During the Vietnam War, this design, coupled with especially dirty propellant, caused early-model M-16s to jam frequently. The rifle has never quite lived down this notorious repuation.
(2) During the Vietnam War, soldiers were told not to fully load the 20 round magazines for their M-16s as the magazine spring was weak and would not reliably feed from a full magazine. When my brother was in Bosnia as a peacekeeper, he had similar directions.
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