Spinta Precision AR-15 9mm Thermal Barrel - 5.25" Nitride (Rainier Arms Exclusive)

To better cool down the barrels and keep it light weight, Spinta Precision created fins so the barrel can have a larger surface area to cool down. They manufacture their thermal barrels with strict tolerances. Their feed cone is one of the best in the industry and made to be reliable. Features & Specifications: 1:10 twist Nitride finish Thermal fins 4150 chrome moly 1/2x28 threaded 7.3oz