Manufactured by Shooting For Perfection:

Brass-Adapter designed to add an additional 3.65 ounces to the Pro-X Barrel Tuner while converting the forward thread to 1-3/8” - 32 tpi to allow common “weights” 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. Total weight of tuner 8.95 ounces once installed.