Trajectory Arms stainless gas tube with roll pin – Midlength

Stainless midlength gas tube, includes 420 stainless steel slotted roll pin

While gas tubes available throughout the industry can vary significantly as well as batch to batch from a given manufacturer, our gas tubes are individually verified to be held to tighter tolerances. This guarantees that every gas tube will seal well with the gas block and gas key, providing a more efficient gas system.

Many times a system that is not running right can be attributable to multiple gas leaks which prevents the necessary amount of gas from reaching the bolt carrier. While it isn’t common for any one component to be the cause, stacking multiple, out of spec parts commonly does cause short stroking issues. Our stainless midlength gas tube will give you comfort in knowing it will provide a reliable seal and improve the reliability of your rifle.

We recommend always verifying gas tube alignment with the gas key any time you build a new upper or service the gas system. This will prevent the key from striking the gas tube resulting in needing to repair or replace your gas key. Things like gas block misalignment, long barrel nuts, or issues with the gas tube port in the upper receiver can cause slight deviations in gas tube alignment.

To verify gas tube alignment, ensure the firearm is unloaded and field strip the BCG. Using the stripped carrier, slide it into the upper receiver and take note of how it engages the gas key. Some slight ticking is ok, but there shouldn’t be any resistance or loud clunk when the gas tube slides into the key.

You can align the gas tube by bending it by hand outside of the upper receiver (with the handguard off) or inside the receiver with something like a screwdriver. Adjust it only little bits at a time. We recommend that if you are going to attempt to manipulate the gas tube from inside the receiver that you use a tool like the M-guns gas tube bender to prevent damage to the tube or receiver.