DSP gas tubes are ideal for your next build or a quality upgrade for an existing rifle. Select your gas tube based on your barrel’s gas port location. For instance, most 16″ AR-15 barrels have a carbine-length gas port, and will be sold as a “carbine” barrel. However, if your barrel is sold as a “mid-length” barrel, you will need a mid-length gas tube.
|System||Barrel Length||Port Distance|
|Pistol||Less than 10 inches||4 inches|
|Carbine||10-18 inches||7 inches|
|Mid||14-20 inches||9 inches|
|Rifle||20 plus inches||12 inches|