Spikes Tactical Barrel 5.56 - 8.1in CHF Pistol. 56 Cold Hammer Forged 8.1in Rifle Barrel Pistol. Spikes Tactical built these Rifle Barrels from DIN 21CrM0V511 steel to achieve an ideal mix of strength and weight. For additional durability the Spikes Tactical 5.56 CHF Pistol Barrel comes equipped with a 1/2 x 28 thread pitch for your muzzle a .750 gas block seat and a ramped barrel extension. Also the black nitride finish improves resistance to corrosion and wear greatly extending the life of your barrel. Constructed to withstand all of your weapon's powerful internal pressures the Spikes Tactical 5.56 CH Pistol Barrel is a prime choice for any build out. Specifications for Spikes Tactical 5.56 Cold Hammer Forged 8.1in Rifle Barrel Pistol: Manufacturer: Spikes Tactical Color: Black Caliber: 5.56x45mm NATO Barrel Length: 8.1 in Gas System Length: Pistol Length Threads per Inch: 1/2x28 Barrel Twist Rate: 1-7 Condition: New Country of Origin: USA Features of Spikes Tactical 5.56 Cold Hammer Forged 8.1in Rifle Barrel Pistol: 8.1in Cold Hammer Forged Barrel DIN 21CrM0V511 1/7 Twist Rate 1/2 X 28 Thread Pitch for Muzzle 5.56 NATO Chamber .750 Gas Block Seat M4 Feed Ramped Barrel Extension Black Nitride Inside and Out Weight: 1lb 2oz Package Contents: Spikes Tactical 5.56 Cold Hammer Forged 8.1in Rifle Barrel Pistol Spikes Tactical SB50810-PL: Barrel 5.56 - 8.1in CHF Pistol