Not sure if it will bear fruit considering the world situation. I know it was his content, but how did you post it on here? It may be one of those manuals like the ones they put out for the AK in case soldiers come across one in combat and are forced to use it for whatever reason. Why would the Marine Corps has such a manual? To make the record straight, what I posted was the link from ridgerunner Im having a hard time figuring out how to add this. November 13, February 07, Never hate your enemy, it only clouds your judgment.
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In the last thirty years there have been many improvements in military Rifle design. With few exceptions, Rifles are now automatic or semi-automatic, they fire a more powerful bullet, make use of lightweight materials and are manufactured with modern production techniques.
One aspect of Rifle design, however, has changed very little over the years and that is the sighting system. Apart from the introduction of the aperture ring to replace the old V notch backsight, the sights in use today would not be unfamiliar to a soldier of one hundred years ago. To have lasted so long these conventional sights must have a lot to commend themand they do. They are cheap, simple and robust and are a reasonable compromise between the demands of extreme accuracy and quick, battle shooting; but as any flustered recruit on the range knows only too well, the problems of trying to focus the backsight, the foresight and the target, all at the same time, takes a great deal of practice to get right.
Conventional sights have a further serious drawback; they are ineffective at night and under poor light conditions. Targets, picked out by the firer, are lost when he tries to lay an aim.
Assuming that the primary task of a Rifle is to hit a point target on the battlefield with an aimed shot, then the optimum design of its sighting system is an essential design requirement. The argument that given a high enough rate of fire, point accuracy does not matter, negates the whole advantage of the Rifle. Experience in counter insurgency operations has shown that targets are usually hard to find, but when they do appear they must be hit first time.
Specialist sights do exist that overcome some of the shortcomings already mentioned. The sniper telescope gives a clear aim picture, but must be used by a skilled man and is far too slow and deliberate in operation for general battle shooting.
The family of image intensifiers coming into service enable targets to be engaged out to several hundred meters in the dark, but they are heavy, bulky and very expensive. There is a clear need, then, for a general combat sight that will improve the chance of a hit under normal daylight battle conditions and which has a a night capability as well. Conventional sights cannot meet the requirement. Some years ago, this deficiency in small arms sights and recognized by the British Army and a design and development project was placed with the Royal Armament Research and Development Establishment RARDE to produce an improved sighting system.
The General Staff Requirements called for a sight with the following main characteristics: 1. Enable the firer to engage targets at night at twice the range at which he can do so with the unaided and desirably at three times the range. Assist in the acquisition and engagement of targets with low background contrast at the effective range appropriate to the weapon. Be capable of attachment to the following weapons: a.
Self Loading Rifle b. General Purpose Machine Gun Light role c. RARDE based their sight on the concept of half a pair of binoculars, fitted with an internal aiming pointer and mounted on the top cover of the Self Loading Rifle. The Sight Unit has a prismatic optical system with a magnification of and a field of view of 8 degrees.
Any increase on these parameters cause the sight to become too bulky. The eyepiece is located centrally over the Rifle axis for use by both left and right handed firers and the objective lens is offset to clear the foresight and muzzle. The eyepiece is protected by a rubber eyeguard, which helps to position the firers eye correctly for a quick shot. The eye relief is only 3 mm and by simply pushing the eyeguard against his brow, the sight is correctly aligned.
The system has a fixed focus, so no fine adjustment is necessary. The aiming mark consists of an inverted pointer with a conical tip that comes down to the centre of the field of view. The tip can be illuminated to a dull orange glow by means of a small tritium trilux source that is mounted in the sight body and which needs no external power fully. A brightness control lever enables the degree of illumination to be varied from zero up to maximum.
The orange colour selected has been found to produce the minimum loss of night vision. A correct aim is achieved by simply placing the tip of the pointer onto the centre of the target. Because of this, the range adjustment is not applied to the pointer, but by moving the whole sight on its mounting.
A range lever on the right hand side of the body operates a cam, raising or lowering the rear of the sight. There are two range settings, normally meters for use by riflemen and meters when the sight is fitted to the light machine gun. Zeroing to the individual has been made as simple as possible. There are elevation and direction screws marked E and D elevate and depress and L and R left and right that can be adjusted by the firer himself with an ordinary screwdriver or even a small coin.
The assistance of an armourer is not necessary. Zero is not lost when the sight is removed. The sight is attached to the Self Loading Rifle by means of a spring latch which engages over a claw on the Rifle top cover. Should the sight become unserviceable, the latch can be tripped and the sight lifted clear, enabling the firer to continue using conventional sights. Attachments have been designed that enable the sight to be fitted to a variety of weapons, including the General Purpose Machine Gun, the 5.
Here a clicker device allows for aim off against moving targets, avoiding the need for a special graticule. A trials programme, lasting many months, has been conducted at the British Army School of Infantry, comparing the new Sight Unit with a number of other sights. The results have been very encouraging. Standard accuracy grouping tests showed that, on average, when using the sight, group sizes were reduced by 3-in at metres. Under low light conditions, the range at which targets could be effectively engaged was at least doubled, even when trialed against conventional sights fitted with an illuminated foresight.
Against difficult, camouflaged targets by day the sight proved useful as a surveillance and acquisition aid, enabling the firer to pick out targets in close cover. This was particularly helpful when firing the General Purpose Machine Gun at targets out to meters. Further trials were conducted under normal daylight conditions against conventional iron sights using a variety of moving, short exposure and pop up targets.
It was found that firers using the Sight Unit took very slightly longer to bring the target into their field of view, but because their sight picture was clearer and aiming more simple the hit rate at pop up targets was comparable and in the case of moving targets, better.
Firers considered that there would be very few occasions, if any, when they would prefer to use their conventional sights. The only conditions that succeeded in defeating the sight were thick mist or driving rain, a problem with all magnifying devices. External misting of the optics themselves was not the problem that had been feared. It never prevented the use of the sight and a quick rub with a handkerchief or even a beret quickly cleared it. Robustness is an essential requirement in any military equipment and in addition to the usual shock tests, temperature cycling, etc, the sight was given more down to earth treatment during the trial, including many drops onto a barrack room floor and frequent trips over the assault course.
At the end of them the sight was still fully operational. Based on the results of the School of Infantry trials it seems that RARDE has produced a sight that fully meets the General Staff Requirement and that is proving to be an effective general purpose combat sight for small arms, superior in nearly every respect to the conventional iron sights that have been in service for so many years.
It provides a night fighting capability, albeit at a reduced range, at a fraction of the cost of an image intensified sight.
The fact that one interchangeable sight will fit 3 of the standard weapons in the infantry platoon gives a further payoff in flexibility and economy.
The British Army is currently putting much effort into improving its standard of battle shooting; the Sight Unit Infantry, Trilux will be an important factor in achieving that aim.
SUIT Trilux Infantry Sight Unit
Original from Belgium, ID plate on stock. Cocks, trigger, hammer and safety functions. Made from metal, barrel is wood, 60 inches long. Only one available. Rifle is in Britain.
CENTURY ARMS L1A1 SPORTER - D1445
FN (Also See BROWNING) Rifles British L1A1