Translation: the M4 barrel is so unreliable that special operations forces units need to swap it out with a barrel from a different gun -- and one that actually works in real combat conditions.

Although the semi-automatic M4-style carbine has dominated the AR market for many years, there is growing interest in ARs more akin to the original design. Why? The rifle-length AR may be your ...

The M4/M4A1 5.56mm Carbine is a lightweight, gas operated, air cooled, magazine fed, selective rate, shoulder fired weapon with a collapsible stock. It is now the standard issue firearm for most ...

The so-called “government profile” adds thickness to the barrel and is designed to keep the weapon shooting longer than M4 carbine barrels in extended firefights without overheating.

The M4’s port pressure measured at 17,000 psi, while the M16’s was at 10,000 psi. Many civilian clones of the M4 utilize longer barrels, but also place mid-length gas systems on their custom ...