Will need hard to find spring tuning kit $$$ - True Precision True-Lock Ultimate Compensator

This comp won't work with single spring recoil kits, which is 90% of them because there is no room for a rod to extend on recoil. Herrington Arms makes a captured spring kit like stock but it's a $100. It works nicely as a comp but not with a standard recoil spring so figure on spending another $100 to make it work.