AR-15 5.56 NATO 14.5" M4 SOCOM Profile Barrel
Designed To Military Specifications
General Barrel Info: The SOCOM barrel is an approved SOPMOD barrel, mostly seen in the US Military SOPMOD M4A1 carbine. The front sight post variety became the M4A1 Block 1 featuring the Knights Armament RAS quad rail, while there were also Block 2 rifles using the Daniel Defense RIS-II FSP rail, with the front sight post sticking out of the rail. Other Block 2 rifles with the flat top Daniel Defense RIS-II M4A1 rail used either a SOCOM barrel or an M4 Government profile barrel, both with the front sight posts removed and a Mk12 gas block from NAVSEA installed.
Colt and FN provided the bulk of the 14-1/2" SOCOM M4A1 barrels, but so did MMC, another government contractor. This barrel is a surplus barrel, new old stock from MMC. New old stock means that the barrel is new - never installed - but is old stock, probably sitting in a warehouse for a number of years. The barrel has been stored in oil and Mil-Spec plastic packaging and is in perfect shape, even including the cardboard wick. All government contract barrels were built to the same military specification.
About This Barrel: The Barrel is made by MMC it is 14.5" long, and is machined from 4150 Chrome Moly Vanadium and finished in a Phosphate appearance. Chambered for 5.56 NATO, using a Government profile design, this barrel will fit your next AR-15 build perfectly.
About the Profile: The SOCOM barrel is basically an M4/A2 in reverse. The barrel is thinner past the gas block and thicker from the chamber to the gas block
Barrel Classification: Pistol
Length: This Barrel is designated as a pistol length barrel with an overall length of 14.5".
Caliber: 5.56NATO - This barrel is chambered to fire both 5.56 NATO and .223 Remington, the most commonly used round designed for the AR-15 platform.
Material: 4150 CrMoV - Chrome-Moly Vanadium, or simply "CMV", is the official mil-spec gun steel developed by Colt Firearms for the military-issued M16 and M4. It contains the same elements as 4150 steel. It also contains Vanadium. Vanadium significantly increases the strength, hardness, and high-temperature stability of the steel.
Finish: Phosphate - Manganese Phosphate finishes are used on barrels to protect against corrosion and wear. Manganese Phosphate finished is considered for its toughness, and is used in multiple different applications such as aerospace, ordnance, and other firearms-related parts.
Thread Pitch: 1/2x28 - This threading is commonly found on barrels chambered in 5.56, .223, and .224. This will allow the installation of most muzzle devices such as flash hiders, blast cans, and compensators threaded to 1/2x28 threads.
Chrome Lined: Chrome Lined barrels have the added property of increased corrosion resistance in the bore from the hot gasses, powder, external elements, & friction from the projectile. Chrome lining is generally preferred for automatic fire as the chrome lining will protect the bore of the barrel during extended use.
Chrome Bore and Chamber:
One of the first modifications that were made to the original M16 in the mid 1960's was the addition of the chrome lined bore and chamber. It is now a world wide standard in the firearms industry for a battle rifle. The chrome bore and chamber is harder than the barrel steel and on the AR rifles will aid in chambering, extraction, and reliability. It increases velocity, and also resist against fouling and corrosion from extended use in the field. This gives the end user a longer barrel life with less required time in maintenance and cleaning.
HPT / MP Inspected Barrels:
Military specifications require that barrels undergo a HPT (High-Pressure Test) load as a part of quality assurance procedures. Commonly referred to as a proof load, the M197 is rated for 70,000 psi. This barrel is proof loaded and then MPI (Magnetic Particle Inspected) to detect any possible flaws in the barrels surface. This barrel is MP inspected with both circular and longitudinal magnetic fields to assure a high quality finished product.
Designed To Military Specifications
Caliber: 5.56 NATO
Profile: M4 SOCOM
Twist Rate: 1-7 T
Finish: Black Phosphate
Chamber and Bore: Chromium Plated/Chrome Lined
Thread Pitch: 1/2x28
Gas Block: Front Fixed Sight Post
Gas Length: Carbine
Packaging: VCI Bag (Vapor Corrosion Inhibitor bag, is a poly packaging film converted to a bag that is manufactured with added VCI chemistry. VCI molecules protect metals from corrosion by forming a thin, invisible layer on the surface.)