Rifle M16 is the standard of Western-style small arms, and understanding the principles of aiming with it is a fundamental skill for any shooter. Unlike the Soviet and Russian schools, where aiming with an open sight along the upper edge of the front sight dominates, the American system is based on the diopter principle and center alignment. Correct technique requires strict adherence to the geometry of the position of the eyes, sights and target.
Key Feature AR-15 platform to which it belongs M16, is the location of the aiming line. It is located significantly above the axis of the bore, which creates a specific ballistic trajectory of the bullet. The shooter must be aware that the bullet crosses the line of sight twice: at short range and at the main shooting distance. Ignoring this fact leads to critical errors when shooting at medium distances, when the bullet passes above the aiming point.
Learning how to aim with M16, does not start with pulling the trigger, but with proper insertion and breath control. Mechanical reliability of the system Direct Impingement (direct gas exhaust) imposes its own requirements for the purity of sighting devices, but in the context of aiming, it is the human factor that is more important. Consistency (consistency of) contribution is what distinguishes a professional from an amateur, allowing hits to be grouped into a minimal circle.
M16 sight design
Standard rifle sights M16 (models A1, A2, A4) consist of a front sight, closed with a muzzle ring, and a drum-type rear sight. The front sight in this system is vertically movable, which allows the shooter to independently make adjustments to the shooting distance without the use of tools, unlike many other systems. Diopter sight (small aperture rear sight) automatically centers the front sight in the field of view, making aiming easier for the shooter.
Rear sight on M16 has two positions: “L” (or 0-2) for shooting at distances up to 300 meters and “8-3” (or just 3-6) for shooting at longer distances. Switching is carried out by turning the drum, which raises or lowers the slot, changing the elevation angle. Shift mechanics requires a clear click to prevent the sight from malfunctioning at a critical moment in combat or training.
⚠️ Attention: Never rely solely on an iron sight when shooting at extreme ranges without first zeroing in the specific ammunition. The dispersion of bullets in different batches of cartridges can significantly shift the average point of impact (MPO).
To improve visibility in low light conditions or when using optics, the front and rear sights are often coated with tritium compounds. However, the main advantage remains the ability to quickly change sights without dismantling. Adjusting wind corrections is carried out by rotating a screw located to the right of the rear sight, which moves the slot to the left or right.
Historical background on the evolution of sights
In early versions of the M16 (A1), the rib was fixed and adjustments were made only with the front sight. Starting with the A2 model, an adjustable turret was introduced, allowing the shooter to adapt to different distances instantly.
Correct aiming technique
The basic principle of aiming from M16 consists of aligning three points: the shooter's eye, the center of the small hole of the rear sight and the upper end of the front sight. Unlike open sights, where the front sight is “placed” on a slot, here the front sight must be perfectly centered in the diopter circle. Pupil of the eye should be located strictly along the axis of the aiming line, which is ensured by the correct emphasis of the butt in the shoulder cavity.
There are two main ways to aim: with the front sight focused and with the target focused. For accurate shooting, it is recommended to focus your vision on the front sight, allowing the target and rear sight notch to be slightly blurred. This ensures maximum clarity of the barrel position. Mistaken Focus on the target leads to “floating” of the front sight and increased bullet spread.
- 🎯 Ideal picture: The front sight is clearly visible in the center of the ring, the top end of the front sight is in line with the top edge of the rear sight slot (or slightly higher, depending on the type of sight).
- 👁️ Eye work: Both eyes should be open. Closing one eye narrows the field of vision and increases fatigue, which is critical during prolonged shooting.
- 🔫 Descent Control: The pressure on the trigger should be smooth, without jerking, so as not to disturb the sight at the moment of shooting.
When shooting from the knee or prone, a bipod or rest is used to increase stability. In a standing position (“from the hand”), stability is ensured by the correct distribution of weight and the work of skeletal muscles. Respiratory cycle also plays a role: the shot is fired during a natural pause after exhalation, when vibrations of the chest are minimal.
Ballistics and shooting at different distances
Understanding Cartridge Ballistics 5.56×45mm NATO (or .223 Remington) is necessary for effective shooting. The trajectory of the bullet is parabolic: after leaving the barrel, the bullet begins to fall, but due to the elevation angle of the barrel relative to the aiming line, it first rises, crosses the aiming line, goes above it, and then falls again, crossing the aiming line a second time at the working distance.
Standard zeroing M16A2/A4 often performed at a distance of 25 meters using a special target that simulates hits at 300 meters. This saves time and landfill resources. With such zeroing, the bullet at a distance of 300 meters will hit exactly the aiming point. Exceedance table shows how the bullet behaves in intermediate segments.
| Distance (m) | High/low (cm) | Aiming point | Recommendation |
|---|---|---|---|
| 25 | -4.0 (conditional) | Target center (correction) | Basic zeroing |
| 100 | +3.5 | Below target | Aim for the bottom edge |
| 300 | 0.0 | Right on target | Basic distance |
| 500 | -80.0 | Above the target | Use drum |
To shoot at distances over 300 meters, the shooter must use the range adjustment drum. By switching to the “5” or “6” division, the shooter raises the rear sight, thereby lowering the muzzle of the barrel and lifting the bullet’s flight path. Amendments Requires finger muscle memory training.
When shooting at an unknown distance, use the "holdover" method, raising the aiming point above the target, instead of turning the drum, which takes time.
Working with optical and collimator sights
Modern operation M16 Rarely does it do without installing additional optics on the Picatinny rail. Collimator sights (Red Dot) allow you to fire from two open eyes, which significantly speeds up target acquisition. The aiming principle remains the same: the red dot must be aligned with the target, but parallax in cheaper models can introduce errors.
Optical sights with magnification (for example, ACOG or variables 1-4x, 1-6x) require a more precise tab. Unlike the diopter, correct eye relief is important here. If the eye is too close, you can get injured (“scope-rush syndrome”), if it is far away, the picture will be cropped. Zero position (zeroing) the optics must be done carefully, since the mechanics of the rifle transmit vibration to the bracket.
⚠️ Attention: When installing the optics, make sure that the mounting screws are tightened to the correct torque (usually 18-22 Nm). Using a torque screwdriver will prevent the zero from being knocked off after the first series of shots.
There is also the practice of installing magnification magnifiers (Magnifier) behind the collimator. This allows you to quickly switch between close quarter mode and precision shooting. The mechanism for tilting the enlarger must be reliable and return to its original position without play. Compatibility The height of the sight axis with the height of the shooter's cheek is determined by using pads on the butt.
☑️ Checking optics before leaving
Typical mistakes when aiming
One of the most common mistakes is incorrect head position, known as “canting.” When the shooter tilts his head or the rifle itself to the side, the vertical adjustments begin to work like horizontal ones, and the bullet goes to the side. Verticality The sighting bar must be constantly monitored, especially when shooting from awkward positions.
Another mistake is “jerking” the trigger or blinking at the moment of firing. The instinctive reaction to sound and recoil causes the shooter to close his eyes or jerk his finger, which moves the muzzle down and to the left (for a right-hander). Dry shooting training (dry fire) helps to develop a smooth descent reflex. Concentration should be on the front sight or collimator point, and not waiting for a shot.
- 🚫 Incorrect emphasis: The butt is not tightly pressed into the shoulder socket, which leads to strong recoil and knocking down the sight.
- 🚫 Eye offset: The eye is not in the center of the diopter, which creates a parallax error even on the mechanics.
- 🚫 Nervous anticipation: The shooter “hangs” on the trigger, waiting for the shot, which leads to tremors and an inaccurate shot.
The mistake of ignoring the wind is also common. At distances over 200 meters, even a light side wind can carry a 5.56 mm bullet tens of centimeters away. Amendments windage is a required skill for sniper and precision shooting.
The main idea of the section: 90% of errors when shooting from the M16 are not related to a malfunction of the weapon, but to a violation of the insertion technique and operation of the trigger mechanism.
Caring for sights
Mechanical sighting M16 susceptible to contamination by powder deposits, especially in the area of the front sight and adjustment drum. Periodic cleaning with a soft brush and solvent is necessary to prevent mechanisms from jamming. Lubrication The rubbing parts of the rear sight should be minimal so that dust and sand do not stick to the oil, turning into an abrasive.
Optics require careful handling: wipe lenses only with special wipes and liquids for optics. Using clothing for wiping can leave micro-scratches, which on a sunny day will turn into “bunnies” that interfere with your view. Protective covers (flip-caps) are recommended to be used during transportation, but removed before shooting.
Regularly checking the mounting of sights and Picatinny rails is a mandatory procedure. Screws tend to loosen due to vibration, so using a thread locker (such as Loctite medium fixation) is critical during initial installation. Visual inspection It takes seconds before each training session, but it saves you from losing your sighting.
How often do you need to recheck your sighting?
It is recommended to check the zeroing after each intense series of shooting (more than 300 shots), after dropping the weapon or hitting hard surfaces, as well as when changing a batch of cartridges. For military weapons, cold inspection (boresighting) is carried out weekly.
Can sights from the M4 be used on the M16?
Yes, all modern scopes with a Picatinny rail (MIL-STD-1913) mount are fully compatible with all modifications of M16 rifles that have a corresponding rail on the receiver.
What to do if the adjustment drum is out of order?
Do not forcefully turn it against the direction of rotation. Reset the sight to “0” (or the base position), then zero again at a distance of 25 or 100 meters, rotating the drum in normal mode.
Does temperature affect aiming?
Yes, cold constricts metals and changes the ballistics of gunpowder. At extremely low or high temperatures, the STP can shift, so shooting in conditions close to combat gives the best result.
Does the front sight mechanism need to be lubricated?
It is better to keep the front sight mechanism (column) dry or with a minimum amount of weapon lubricant, since it is located in the zone of maximum contamination with powder fumes. Excess oil will attract dust.