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Fork tube lengths5/24/2023 The best gas tube length for an AR-15 is a 9.75″ carbine length gas tube on a 14.5″ carbine barrel like the M4 used by the US Army. What’s The Best Gas Tube Length For An AR-15 The gas tube will usually be a couple inches longer than the port length since the gas tube needs to stick into the upper receiver a little bit. Here’s a reference chart showing the actual measurements of the different gas tube lengths: Gas Tube Lengthĭon’t confuse gas tube length with the port length on the barrel. So look at the specs of the barrel you’re buying. That will determine which gas tube length you need. It all depends on where the gas port is drilled in the barrel. Pistol, carbine, mid, intermediate, and rifle length gas systems can be used on a number of different barrel lengths.įor example, a 14 inch barrel can be sold with a carbine gas system or a mid-length gas system. ![]() There are 5 different gas tube lengths used on the average AR-15 with each length having a range of measurements. Gas Tube Length For an 18″ Barrel AR Gas Tube Lengths
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