Rifles - Cartridges - Ballistics - Copyright.
Autoloading Rifles:
AK-47 - AR-15 - Barrett
M16 - M4 - M-14
M-1 Carbine - M-1 Garand
Ruger 10/22 - Ruger Mini 14
SKS - Grenade Launchers - Silencers
M4 Assault Rifle:
(Part 1. AR15 - Part 2. M16 - Part 3. M4)

 Like all the variants of the AR-15 and M16, the M4 and the M4A1 can be fitted with many accessories, such as night vision devices, suppressors, laser pointers, telescopic sights, bayonets, bipods, either the M203 or M320 grenade launchers, the M26 MASS shotgun, and anything else compatible with a MIL-STD-1913 Picatinny rail. These rifles will fire the 5.56x45 NATO cartridge and the 223 Remington commercial cartridge as well.

 The M4A1 carbine is a fully-automatic variant of the basic M4 carbine intended for special operations use.
The M4A1 has a "S / 1 / F" (safe / semi-automatic / fully automatic) trigger group.
The M4 has a "S / 1 / 3" (safe / semi-automatic / 3-round burst) trigger group.
 The M4A1 is used by almost all U.S special operation units.

 The M4A1 is especially favored by counter-terrorist and special forces units for close quarters combat because of the carbine's compactness and firepower. These features are also very useful in urban warfare. Although the M4 has less effective range than the longer M16, many military analysts consider engagement with a non-specialized small arm above a range of 330 yards to be unnecessary. It is effective at ranges of 160 yards or less and has a maximum effective range of about 550 to 660 yards.

 In the last few years, M4A1 carbines have been refit or received straight from factory with barrels with a thicker profile under the handguard. This is for a variety of reasons such as heat dissipation, which is useful due to the complaints of high-heat production from test soldiers, which occurs during full-auto fire. These heavier barrel weapons are also fitted with a heavier buffer known as the H2.

Resources And References:
Rifling Twist Rates
Rifling Twist Effects
Rifle Barrel Break-In
Rifle Barrel Cryogenics
Rifle Barrel Free-Bore
Rifle Scopes
Rifle Scope Mounts
Rifle Scope Mounting
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Precision Sight-In Target Precision 100 Yard Sight-In Target Precision 25 Yard Target Precision 50 Yard Target Precision 75 Yard Target Precision 100 Yard Target
Free Rifle Targets:
Precision 200 Yard Target Precision 300 Yard Target Precision 400 Yard Target Precision Bold Orange Grid Sight-In Target Precision Bold White Grid Sight-In Target Precision Bold Black Grid Sight-In Target
Centerfire Rifle Cartridges:
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Centerfire Rifle Cartridges:
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