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Description
M1870 Test Rifle-The first in its line to be introduced to the US Army. It was field tested before complete adoption were it was found to be too heavy.
Seen here-www.deviantart.com/tylero79/ar…

M1871-Imformally known as just the "Long Rifle" after the adoption and gradual replacement by the M1872 Short Rifle, the M1871 looked to solving the weight problem by just cutting off most of the wood, creating its skeletal shape. It was still a bit unwieldy, but manageable. It had a tube magazine that held eight rounds.
Seen here-www.deviantart.com/tylero79/ar…

M1871 Sharpshooter Rifle-The M1871 was also introduced with a sharpshooter's (i.e. sniper's) rifle, which had a slightly longer barrel and a bipod built into the rifle.
Seen here-www.deviantart.com/tylero79/ar…

M1872 Short Rifle-The M1872 was introduced to deal with the issue of the M1871 being a bit unwieldy. The rifle was shortened a bit and its magazine was reduced by one round, from eight to seven. It gradually replaced the M1871 "Long Rifle", and by the end of the war, more factories were producing the M1872 than they were the M1871.
Seen here-www.deviantart.com/tylero79/ar…

M1872 Dragoon Rifle-This rifle held five rounds in its magazine. It was introduced for the cavalry, hence the name "Dragoon". Despite being reserved for the cavalry, it was still popular with the infantry whenever they could get their hands on them.
Seen here-www.deviantart.com/tylero79/ar…

M1873 "Trailblazer" Carbine-The M1873 "Trailblazer" Carbine was quickly introduced to meet demands during the Great Northwest Indian War (1867-1875) for a short, compact rifle. The "Trailblazer" held four rounds as a result of its size. The Trailblazer was popular with units in Dakota and Montana, and became just as popular with Union cavalry fighting against the Confederacy and with the Secret Service.
Seen here-www.deviantart.com/tylero79/ar…

M1872 Shotgun-The Model 1872 Shotgun was a simple conversion to a 24 gauge shotgun. It was designed more for civilian use then military use, but the Civil War and the Great Northwest Indian War resulted in the entire line being used almost solely by the military. It became popular with the police, the Navy, and siege troops when they would break through enemy lines and have to fight up close.
Seen here-www.deviantart.com/tylero79/ar…

Agar Mk.3, Model 1873 "Test" Weapon-A modification of the Agar Mk.2, the Agar Mk.3 was a radical redesign of its predecessor. Development began around the same time as the Springfield Model 1871 was finishing up. Created by the same person as the Mk.1 and Mk.2, the Mk.3, M1873 was adopted as a test weapon. The first few were put to use in the Great Northwest Indian War (1867-1875), were the units using it like its relative ease of use and firepower. The Army adopted it, but not before it was redesigned. The Mk.3, Model 1873 used the same receiver as the M1871, just modified to accept detachable box magazines. After the redesign, the Model 1873 simply became the Mk.3a, and a few were still in use until the end of the Civil War.

Agar Mk.3, Model 1874-After the US Army accepted the Mk.3a, the receiver was redesigned to simplify production. The new design was baptized in the first few months of 1874 during the Ohio Campaign. Ten-thousand Mk.3's were given to veteran units being gathered for a counter-offensive. The Mk.3 proved highly effective, decimating Confederate forces. The weapon's main drawback was that it ate ammo at a far greater rate than any other weapon in the Union arsenal. By the end of 1874, the Union Army placed an order for over 300,000 of these new weapons. The Mk.3 ended up playing a decisive role in the Union's invasion of Virginia in 1876. The firepower of the Mk.3 in the hands of some of the most experienced Union veteran units played a key role in smashing through the Confederates' dreaded "Cotton Bale" (a series of defenses in Northern Virginia consisting of earthworks, fortresses, and landmines), allowing the Union Army to march on Richmond.
Seen Here-www.deviantart.com/tylero79/ar…

M1875 Short Rifle-Due to being unable to meet demand of the M1872, Springfield began handing out license to other arms manufacturers to produce them. The American Rifle Company was one such company. In late 1874, it also took on a contract to produce Agar Mk.3's. The company decided it would be best to simplify production by using the same receivers for both weapons and to simplify the M1872 down even more than it already was. The result was the M1875 line of rifles. While they were still as well made as the M1872, they entered production late in the war, only being around for the last two years of it. By 1876, most arms manufacturers began producing the M1875.

M1875 Dragoon-Same story as the M1875 Short Rifle.

Agar Mk.4, Automatic Carbine-Sometimes just called the Auto-Carbine, or the Agar Light Automatic Carbine (though this tends to create confusion with the American Rifle Company's own M1875 Light Automatic Carbine). The Mk.4 was introduced to provide a lighter weight and more mobile version of the Agar Mk.3.
Seen Here-www.deviantart.com/tylero79/ar…

M1875 Light Automatic Carbine-The American Rifle Company that took on the M1874 Semi-Auto Army Pistol design, decided their was some worth to the mostly abandoned Agar Mk.3 pistol cartridge conversion project. They decided to buy the rights to the project and took it over. They decided to cut down the receiver due to the smaller cartridge can completely removed the interchangeable barrels that the Agar Mk.3 used. They came to a similar, though slightly different, design than the Agar Mk.4, Automatic Carbine.
Seen Here-www.deviantart.com/tylero79/ar…

M1874 Semi-Automatic Army Pistol-The Model 1874 was designed as the result of an experiment to lighten the Agar Mk.3 by rechambering it to the US Army's pistol cartridge, the .58-48 Government round. While that program was eventually scaled back due to a disappointing drop in the weapon's effective range, on designer took the design and decided to go a different route. Seeing the US military using multiple sidearms, they decided to create what could be a single universal sidearm. They took that modified receiver from the moribund Agar carbine project, removed the stock and foregrip, added a pistol grip, made the action semi-automatic, and properly realigned the gun's new sights. By 1873, the weapon was presented to the US army and after several tests and field trials went ahead and adopted it as the Model 1874, Semi-Automatic Army. The idea was to replace the M1869 Warhawk, M1870 Double-Action Calvary, and M1873 Double-Action Army revolvers with the M1874, but production couldn't keep up with demand until after the war.
Seen Here-www.deviantart.com/tylero79/ar…

M1876 "Trailblazer" Carbine-Produced by the American Rifle Company in the last few months of the war. The M1876 took the redesigned receivers used for the M1875 rifles and placed them on an M1873 "Trailblazer's" body. Due to its late introduction, it saw limited use with a few elite Union Army units and the Secret Service.

Description
M1870 Test Rifle-The first in its line to be introduced to the US Army. It was field tested before complete adoption were it was found to be too heavy.
Seen here-www.deviantart.com/tylero79/ar…

M1871-Imformally known as just the "Long Rifle" after the adoption and gradual replacement by the M1872 Short Rifle, the M1871 looked to solving the weight problem by just cutting off most of the wood, creating its skeletal shape. It was still a bit unwieldy, but manageable. It had a tube magazine that held eight rounds.
Seen here-www.deviantart.com/tylero79/ar…

M1871 Sharpshooter Rifle-The M1871 was also introduced with a sharpshooter's (i.e. sniper's) rifle, which had a slightly longer barrel and a bipod built into the rifle.
Seen here-www.deviantart.com/tylero79/ar…

M1872 Short Rifle-The M1872 was introduced to deal with the issue of the M1871 being a bit unwieldy. The rifle was shortened a bit and its magazine was reduced by one round, from eight to seven. It gradually replaced the M1871 "Long Rifle", and by the end of the war, more factories were producing the M1872 than they were the M1871.
Seen here-www.deviantart.com/tylero79/ar…

M1872 Dragoon Rifle-This rifle held five rounds in its magazine. It was introduced for the cavalry, hence the name "Dragoon". Despite being reserved for the cavalry, it was still popular with the infantry whenever they could get their hands on them.
Seen here-www.deviantart.com/tylero79/ar…

M1873 "Trailblazer" Carbine-The M1873 "Trailblazer" Carbine was quickly introduced to meet demands during the Great Northwest Indian War (1867-1875) for a short, compact rifle. The "Trailblazer" held four rounds as a result of its size. The Trailblazer was popular with units in Dakota and Montana, and became just as popular with Union cavalry fighting against the Confederacy and with the Secret Service.
Seen here-www.deviantart.com/tylero79/ar…

M1872 Shotgun-The Model 1872 Shotgun was a simple conversion to a 24 gauge shotgun. It was designed more for civilian use then military use, but the Civil War and the Great Northwest Indian War resulted in the entire line being used almost solely by the military. It became popular with the police, the Navy, and siege troops when they would break through enemy lines and have to fight up close.
Seen here-www.deviantart.com/tylero79/ar…

Agar Mk.3, Model 1873 "Test" Weapon-A modification of the Agar Mk.2, the Agar Mk.3 was a radical redesign of its predecessor. Development began around the same time as the Springfield Model 1871 was finishing up. Created by the same person as the Mk.1 and Mk.2, the Mk.3, M1873 was adopted as a test weapon. The first few were put to use in the Great Northwest Indian War (1867-1875), were the units using it like its relative ease of use and firepower. The Army adopted it, but not before it was redesigned. The Mk.3, Model 1873 used the same receiver as the M1871, just modified to accept detachable box magazines. After the redesign, the Model 1873 simply became the Mk.3a, and a few were still in use until the end of the Civil War.

Agar Mk.3, Model 1874-After the US Army accepted the Mk.3a, the receiver was redesigned to simplify production. The new design was baptized in the first few months of 1874 during the Ohio Campaign. Ten-thousand Mk.3's were given to veteran units being gathered for a counter-offensive. The Mk.3 proved highly effective, decimating Confederate forces. The weapon's main drawback was that it ate ammo at a far greater rate than any other weapon in the Union arsenal. By the end of 1874, the Union Army placed an order for over 300,000 of these new weapons. The Mk.3 ended up playing a decisive role in the Union's invasion of Virginia in 1876. The firepower of the Mk.3 in the hands of some of the most experienced Union veteran units played a key role in smashing through the Confederates' dreaded "Cotton Bale" (a series of defenses in Northern Virginia consisting of earthworks, fortresses, and landmines), allowing the Union Army to march on Richmond.
Seen Here-www.deviantart.com/tylero79/ar…

M1875 Short Rifle-Due to being unable to meet demand of the M1872, Springfield began handing out license to other arms manufacturers to produce them. The American Rifle Company was one such company. In late 1874, it also took on a contract to produce Agar Mk.3's. The company decided it would be best to simplify production by using the same receivers for both weapons and to simplify the M1872 down even more than it already was. The result was the M1875 line of rifles. While they were still as well made as the M1872, they entered production late in the war, only being around for the last two years of it. By 1876, most arms manufacturers began producing the M1875.

M1875 Dragoon-Same story as the M1875 Short Rifle.

Agar Mk.4, Automatic Carbine-Sometimes just called the Auto-Carbine, or the Agar Light Automatic Carbine (though this tends to create confusion with the American Rifle Company's own M1875 Light Automatic Carbine). The Mk.4 was introduced to provide a lighter weight and more mobile version of the Agar Mk.3.
Seen Here-www.deviantart.com/tylero79/ar…

M1875 Light Automatic Carbine-The American Rifle Company that took on the M1874 Semi-Auto Army Pistol design, decided their was some worth to the mostly abandoned Agar Mk.3 pistol cartridge conversion project. They decided to buy the rights to the project and took it over. They decided to cut down the receiver due to the smaller cartridge can completely removed the interchangeable barrels that the Agar Mk.3 used. They came to a similar, though slightly different, design than the Agar Mk.4, Automatic Carbine.
Seen Here-www.deviantart.com/tylero79/ar…

M1874 Semi-Automatic Army Pistol-The Model 1874 was designed as the result of an experiment to lighten the Agar Mk.3 by rechambering it to the US Army's pistol cartridge, the .58-48 Government round. While that program was eventually scaled back due to a disappointing drop in the weapon's effective range, on designer took the design and decided to go a different route. Seeing the US military using multiple sidearms, they decided to create what could be a single universal sidearm. They took that modified receiver from the moribund Agar carbine project, removed the stock and foregrip, added a pistol grip, made the action semi-automatic, and properly realigned the gun's new sights. By 1873, the weapon was presented to the US army and after several tests and field trials went ahead and adopted it as the Model 1874, Semi-Automatic Army. The idea was to replace the M1869 Warhawk, M1870 Double-Action Calvary, and M1873 Double-Action Army revolvers with the M1874, but production couldn't keep up with demand until after the war.
Seen Here-www.deviantart.com/tylero79/ar…

M1876 "Trailblazer" Carbine-Produced by the American Rifle Company in the last few months of the war. The M1876 took the redesigned receivers used for the M1875 rifles and placed them on an M1873 "Trailblazer's" body. Due to its late introduction, it saw limited use with a few elite Union Army units and the Secret Service.