Gas Tubes for AR-15

Product Description

A gas tube is essntial for AR-15-pattern firearms to carry hot gases back to the bolt carrier group.

What length of gas tube do I need?

Take your barrel and measure the distance from the breech end overall to the gas block shoulder, in inches. Look up this number on the chart below.

Distance to gas block shoulder	Gas tube size
3 3/4"	5.8" (AR-15 Short pistol)
4 5/8"	6.75" (AR-15 Pistol)
7 7/8"	9.75" (AR-15 Carbine)
9 7/8"	11.75" (AR-15 Midlength)
11 3/4"	13 5/8" (AR-15 Intermediate)
13 1/4"	15.125" (AR-15 Rifle)

Features: Weight varies from 10g to 28g depending on length
You get: (1) gas tube of the chosen length
You need to get separately: (1) Gas tube roll pin (usually comes with the gas block)
Compatible with: Standard AR-15/M16 gas blocks (regardless of barrel diameter) AR-15/M16 Barrels regardless of caliber Standard upper receivers Mil spec gas keys on BCG Mill spec and free float barrel nuts Mill spec gas tube roll pins
Tools required: It may help to have some needle-nose pliers or a pin punch to drive in the Gas Tube Roll Pin.
Installation Tips: One easy way is to get a starter punch and simply wiggle it into the gas block by hand until the punch bottoms out, then switch to a roll pin (nipple ended) punch. If you are replacing a Gas Tube, we recommend installing a new Roll Pin for factory-fresh retention strength.