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                                                Barrels of fun

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4140 steel – not the best nor is it mil spec 40% carbon

4150 steel – 50% carbon harder molybdenum steel not mil spec

4150 CMV /41v50 Chrome moly vadanium ChMoV

Melonited vs parkerised

Mel is harder and doesn’t need chromelining and is better against corrosion

Stainless

Stainless doesn’t need a finish as much. Still can rust but doesn’t always

416 softer easier to machine higher sulfer content fails easier at low temps

416R has molybdenum and preforms better in cold but still easy to machine

17-4-PH Parcipitent Hardening Makes little pores to strengthen the steel 3-5x cost and isn’t a good machine gun barrel

Carbon fiber barrels

Still a steel barrel but has a carbon fiber wrap for heat mitigation and weight savings

Rifling

Button rifled  cheapest and fastest rougher way to make it. It pushes a bit through the bore to add the rifling

Cut rifling cutter runs down barrel and expands a tiny bit each time oldest and a cleaner method  could be the most accurate

Cold hammer forging  barrels are hammered around a mandrel that is then screwed out of the barrel after it is completed

Gas legnths

Rifle length gas system, the gas port is roughly 12 inches from the chamber

A Mid-length system’s gas port is roughly 9 inches from the chamber.

A Carbine length system has its port approximately 7 inches from the chamber

 Pistol length system has a port about 4 inches away.