Spikes Tactical Barrel 5.56 - 16in M4 LE w/ Gas Block. 56 Barrel Extension to ensure more precise shots from your firearm. Spikes Tactical manufactured these AR15 Barrels from sturdy MIL-B-11595E CMV steel complete with a Mil-Spec phosphate coating to ensure maximum protection against harmful corrosive elements. For even further corrosion resistance the Spikes Tactical 16in M4 LE 1/2 x 28 Thread Pitch 5.56 Barrel is chrome-lined which also creates a much easier cleaning experience. Keep your weapon in pristine condition and performing to its highest capabilities by upgrading to a Spikes Tactical 16in M4 LE 5.56 1/7 Twist Barrel. Specifications for Spikes Tactical 16in M4 LE- 5.56 Barrel Extension: Manufacturer: Spikes Tactical Color: Black Caliber: 5.56x45mm NATO Barrel Length: 16 in Threads per Inch: 1/2x28 Barrel Twist Rate: 1-7 Gun Model: M4 Condition: New Country of Origin: USA Features of Spikes Tactical 16in M4 LE- 5.56 Barrel Extension: MIL-B-11595E CMV Chrome Lined 1/7 Twist Rate 1/2 X 28 Thread Pitch for Muzzle 5.56 Nato Chamber M4 Feed Ramped Barrel Extension Mil-Spec Phosphate Coating Package Contents: Spikes Tactical 16in M4 LE- 5.56 Barrel Extension What firearm models does the manufacturer say Spikes Tactical 16in M4 LE- 5.56 Barrel Extension is compatible with? The manufacturer says that Spikes Tactical 16in M4 LE- 5.56 Barrel Extension is compatible with M4Spikes Tactical SB51605-M4G: Barrel 5.56 - 16in M4 LE w/ Gas Block