Manufactured by Shooting For Perfection:

Extra Thread Adapters are available for shooters using the Pro-X Tuner (discontinued).

Aluminum and Brass Thread Adapter designed to convert the forward thread of the Pro-X Barrel Tuner to 1-3/8” - 32 tpi without the additional weight with the aluminum version, and adding 3.65 ounces with the brass version, (brass version yields a total tuner weight of 8.95 ounces).

The 1-3/8” - 32 tpi thread is to allow common “weight kits” of this thread size to be used, (weights not sold by CST). Adds .467” to the length of the tuner once installed, with a .925” through hole.