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The gas block is the component that fits over the small hole on the top of an AR-15's barrel. As gunpowder in the cartridge explodes and drives the bullet through the barrel and past this hole, some of the hot gas escapes through it. This hot gas enters the gas block and then gets directed down the gas tube.What is AR - 15 gas tube?
The pistol-length gas system is used almost exclusively on AR-15 pistols or AR-15 rifles with very short barrels, usually 10 inches long or less. These systems generally have a gas tube of approximately 4.5 inches. The handguards or free-float tubes for these systems are generally between 3 to 4 inches in length.What is a gas block?
Gas block. The gas block is the part of the firearm that regulates how much gas from the fired cartridge gets back to the action in the receiver, in order to cycle the weapon.