Welcome to the Configurator at riflespeed.com, an online calculator that makes it quick and easy to determine which model of RIFLESPEED Gas Control is right for your AR15- or AR10-style firearm. RIFLESPEED Gas Controls are currently available for barrels with a 0.750" diameter gas seat journal. Gas Controls are available in four lengths. Simply enter your firearm's details into the Configurator below. Based on your inputs, Gas Control models that DO fit your firearm will be highlighted in GREEN. Models that DO NOT fit your firearm will be highlighted in RED. If more than one model fits your carbine, we recommend selecting the shortest model in most cases.
An ideal fit places the Control Knob so that it protrudes between 0.6 inches and 2.0 inches beyond the front of your handguard. A minimum of 0.4 inches is required for sufficient access. The Configurator is set to allow a minimum of 0.4 inches of exposed Control Knob. If you have a muzzle device that extends behind the thread shoulder you’ll need to subtract the rearward extension length from your barrel length measurement.
If your exact configuration is not listed in the configurator you can use the color-coded image below to determine which model of Gas Control fits your needs. The color-coded image overlays each Riflespeed Gas Control model over four upper assemblies with different gas systems. From Top to bottom these represent a Pistol-length gas system, Carbine-length gas system, Mid-length gas system, and Rifle-length gas system.
Measure the distance from the front of your upper receiver to the back of your gas block or the shoulder against which your gas block will seat. Compare that with the image to determine which gas system you have. Make note of this information to reference when purchasing the corresponding gas tube for your configuration. Next, measure your handguard and pick the Gas Control that leaves a portion of the Control Knob exposed in front of your handguard. Make sure your barrel extends beyond the Control Knob once your Gas Control is installed. If your barrel is threaded at the muzzle, the Control Knob should be 0.9 inches or more behind the muzzle. This allows room for the installation of a muzzle device and clearance for disassembly of your Gas Control.
Using the color-coded image below and the example of an 11.5-inch barrel with a Carbine-length (7.3-inch) gas system, 0.750" journal diameter, and a 9.5-inch handguard we can determine that the correct model of Riflespeed Gas Control is the RS7533 represented in green.
There is a helpful article with information and pictures that cover in more detail how to get the right measurements of your firearm's components here: How to select the correct Gas Control for your carbine
Click this link once you've determined the correct size Gas Control for your carbine.
If there are no models that fit your configuration feel free to email [email protected] and we'll work to determine the best path forward. In some configurations there simply is no compatible Gas Control due to a lack of clearance in front of the handguard. If your configuration is not compatible we can suggest several options.