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Description
This is a weapon from the Book series called Frontlines by Marko Kloos all rights go to him. The reason I did something like this is to promote the Frontlines Series which is almost ten years old come next year and to inspire other fan-made content.
If the text isn't easy to read on the top then here's what it says
(Note the Information provided is none-canon provided by FIMfiction User Carmine Prophet, all rights go to them)
In the chaos of combat, you might not know where the enemy is, but with enough firepower,
you can always make them keep their heads down. In the early twenty-first century, it was thought that the modern rifle has thirty rounds and is forged from iron and furnished in plastic.
It should kill a man in a single shot and kick like a rabbit, and be as reliable as the AK-47 in the process.
This one, however, is different, the M-66 is the definitive weapon of the North American Commonwealth, it dares to break tradition in the face of modern warfare,
controversial at first it managed to shed its bad reputation and became an institution.
So why did the NAC abandon their 5.56, what problems did this design face, and what makes it perfect for use in the modern age over one hundred years after its introduction?
The end of World war three changed everything, traditional tactics, were outmoded, combat was faster paced, closer range,
but everyone wore body Armor that could block the others rounds. This meant that combat was not just about volume of fire, but Armor piercing ability and accuracy.
Misriah Armory was founded in 2052, as a division of Wayland-Yutani and design was lead by American small arms designer Avery Johnson, in response for the newly formed NAC's need for a new rifle the AR-50 was developed.
Its bullpup design, polymer body, titanium receiver and ability to link with Armor's computer made for a truly modern platform.
At first, the weapon was designed to be used with the old 5.56x45 used by its pressor, but these rounds proved to be almost useless against modern ceramic ballistic hard-shell.
But with inspiration from the development of the NAC PDW the MP-15 and its ammunition, came the use of the 10mm caseless flechette.
The tungsten flechette's ability to go straight through conventional battle Armor and devastate flesh while being much smaller than the 5.56 changed everything.
So with a change to the weapon's receiver, the advent of internal cooling, and the addition of a larger magazine it allowed the user to carry 250 rounds in a magazine that now fit snugly into the butt of the weapon.
The known as the Misriah Armory AR-50 was adapted to fire this smaller cartridge and under Misriah's patronage, the rifle was adopted by the NAC's military in 2066.
With a new home came a new designation, the M-66. There would be no delay before the rifles first trial, under the challenging political conditions of the race to colonize space, deployed during the first Mars war.
Mars was a taxing environment, Martian dust would get into the internals, leading to jamming and the weapons lack of grenade launcher made for it to be hated, forcing the users to carry a second weapon.
Some parts were surprisingly fragile and without diligent maintenance stoppages and failures were frequent.
But perhaps the worst thing was the weapon being designed to be used on earth, would fail to fire in a complete vacuum,
a deadly shortcoming, given the thin atmosphere of Mars. Compared to the SRA's own flechette rifle the S-MAG it would fall short almost every time.
So to combat this the designers at Misriah took this new information to heart, and took the M-66 to the drawing board.
And after a year of R&D and pressure from the NAC they integrated a grenade launcher into the weapon's casing, sealed the internals to allow it to work in a vacuum,
reinforced the fragile portions and added an integrated targeting laser and more attachment hardpoints.
And with this, the designers at Misriah had thought they had created a weapon that would allow an NAC trooper to beat someone to death with its weight, suppress a threat, or be a marksman.
But what they really made was something that could withstand the test of time. During it's over a century of service soldiers of the NAC's Defence corps would respectfully call it "The 66".
It'll work on the land, under water, and in space. Over a century of aiding the NAC and her interests.

The M-66, an American classic, a weapon, for now, reliable, deadly.

Description
This is a weapon from the Book series called Frontlines by Marko Kloos all rights go to him. The reason I did something like this is to promote the Frontlines Series which is almost ten years old come next year and to inspire other fan-made content.
If the text isn't easy to read on the top then here's what it says
(Note the Information provided is none-canon provided by FIMfiction User Carmine Prophet, all rights go to them)
In the chaos of combat, you might not know where the enemy is, but with enough firepower,
you can always make them keep their heads down. In the early twenty-first century, it was thought that the modern rifle has thirty rounds and is forged from iron and furnished in plastic.
It should kill a man in a single shot and kick like a rabbit, and be as reliable as the AK-47 in the process.
This one, however, is different, the M-66 is the definitive weapon of the North American Commonwealth, it dares to break tradition in the face of modern warfare,
controversial at first it managed to shed its bad reputation and became an institution.
So why did the NAC abandon their 5.56, what problems did this design face, and what makes it perfect for use in the modern age over one hundred years after its introduction?
The end of World war three changed everything, traditional tactics, were outmoded, combat was faster paced, closer range,
but everyone wore body Armor that could block the others rounds. This meant that combat was not just about volume of fire, but Armor piercing ability and accuracy.
Misriah Armory was founded in 2052, as a division of Wayland-Yutani and design was lead by American small arms designer Avery Johnson, in response for the newly formed NAC's need for a new rifle the AR-50 was developed.
Its bullpup design, polymer body, titanium receiver and ability to link with Armor's computer made for a truly modern platform.
At first, the weapon was designed to be used with the old 5.56x45 used by its pressor, but these rounds proved to be almost useless against modern ceramic ballistic hard-shell.
But with inspiration from the development of the NAC PDW the MP-15 and its ammunition, came the use of the 10mm caseless flechette.
The tungsten flechette's ability to go straight through conventional battle Armor and devastate flesh while being much smaller than the 5.56 changed everything.
So with a change to the weapon's receiver, the advent of internal cooling, and the addition of a larger magazine it allowed the user to carry 250 rounds in a magazine that now fit snugly into the butt of the weapon.
The known as the Misriah Armory AR-50 was adapted to fire this smaller cartridge and under Misriah's patronage, the rifle was adopted by the NAC's military in 2066.
With a new home came a new designation, the M-66. There would be no delay before the rifles first trial, under the challenging political conditions of the race to colonize space, deployed during the first Mars war.
Mars was a taxing environment, Martian dust would get into the internals, leading to jamming and the weapons lack of grenade launcher made for it to be hated, forcing the users to carry a second weapon.
Some parts were surprisingly fragile and without diligent maintenance stoppages and failures were frequent.
But perhaps the worst thing was the weapon being designed to be used on earth, would fail to fire in a complete vacuum,
a deadly shortcoming, given the thin atmosphere of Mars. Compared to the SRA's own flechette rifle the S-MAG it would fall short almost every time.
So to combat this the designers at Misriah took this new information to heart, and took the M-66 to the drawing board.
And after a year of R&D and pressure from the NAC they integrated a grenade launcher into the weapon's casing, sealed the internals to allow it to work in a vacuum,
reinforced the fragile portions and added an integrated targeting laser and more attachment hardpoints.
And with this, the designers at Misriah had thought they had created a weapon that would allow an NAC trooper to beat someone to death with its weight, suppress a threat, or be a marksman.
But what they really made was something that could withstand the test of time. During it's over a century of service soldiers of the NAC's Defence corps would respectfully call it "The 66".
It'll work on the land, under water, and in space. Over a century of aiding the NAC and her interests.

The M-66, an American classic, a weapon, for now, reliable, deadly.