Adaptive Tuning System Instructions

Tuner Instruction Guide




NOTE: If you install 3 set screws, the unit will be more likely to vibrate loose.  ONLY USE 1 SET SCREW! - One (1) spare set screw has been provided.

Prior to installing the Adaptive Tuning System (ATS), please make sure that the tuner weight rotates freely on the collar with the set screw loose and that the external weight is sitting slightly behind the front face of the internal collar. The internal collar has both a threaded and smooth section. The smooth section is the surface you will want the set screws to tighten against. If you thread the tuner too far back, and tighten the set screws, you may damage the threads. Testing has shown that generally a load can be tuned in less than 2 turns however results will vary.

  1. Tighten 1 set screw down making sure that the set screw is not contacting the internal collar threads.                                                                   
  2. Install the tuner on your rifle by hand and tighten down by hand. Do not attempt to over-tighten the tuner as you may strip the internally threaded collar muzzle threads. If the outer weight rotates during install you can tighten the set screw more or install another set screw during initial install. – Make sure the tuner is threaded completely on and against the shoulder!                                                                       
  3. Install your muzzle brake, suppressor, or thread protector of choice. The tuner will be held in place by your muzzle brake, suppressor, or thread protector. All tuners have been plug gauged to ensure proper fit. If it does not fit, then your muzzle threads are mostly likely oversized or have carbon buildup. This is  not uncommon and if this happens, you can attempt to clean your threads or if the ATS does not fit, it is possible that your threads are oversized. The tuner is nitrided and if your fitment is tight, you can put a small amount of grease on the tuner threads and thread it on your muzzle. Since the tuner threads are harder than your muzzle threads in some cases it can “clean” them up if slightly oversized. If the fit is too tight, DO NOT force the tuner.                                                          
  4. You have been provided 1 additional set screws to retain as spares, KSS recommends only using 1 of the set screws during tuning and usage as this creates the most consistency in the tuning process as well as securing the external weight. KSS suggest checking the set screw periodically especially in a competition setting.  When tuning, tighten the set screw as if you were finished tuning and ready to go shoot a match - GO SHOOT.




The following can be used as general guidance, but each rifle will vary. The tuner set screw must be tightened before shooting! Initial groups may be worse than groups without the tuner however if you follow the process outlined below, KSS is confident the tuners performance can help enhance your groups and consistency.

  1. Start with the tuner weight slightly behind the face of the internal collar. Confirm Zero on your rifle and record your tuner starting position and fire some confirmation shots. You should have a target that allows you to shoot multiple groups at different aim points. Here is a link to a printable target you can download. Grid squares are approximately .1mil.                    
  2. Rotate the tuner between each grouping of shots and secure the set screw as you would if you were going to a match. You should be able to recognize fairly quickly if it looks like its grouping using 2 shots to help limit ammo usage during tuning. See Hash guidance below.       
    1. The tuners have 24 reference hash marks – Increase 2 reference mark per adjustment cycle
    2. DO NOT OVER TIGHTEN THE SET SCREWS OR YOU RISK STRIPPING THEM!                                                                              
  3. Take note of the location and dispersion of your group relative to your point of aim. You will see your groups move around your aim point as well as get bigger or smaller at certain locations. Do not adjust your zero during this process.                                                                                           
  4. When you start to see similar group size / POI location, you can then fine tune between tuner locations.                                                                           
  5. If you are traveling for the shooting sports, and your rifle/ammo combo does not perform the same once at your destination, you can use the tuner to quickly get the rifle shooting again. We have found that the group can usually be tuned back in within a few hash marks in either direction.                 
  6. Example groups/nodes to look for during the tuning process can be viewed below.



At this time the Adaptive Tuning System (ATS) only supports muzzle brakes that tighten and shoulder against the normal muzzle shoulder. Examples of these are the self-tightening styles via the use of a reverse jam nut or similar. Example muzzle brakes include, Patriot Valley Arms, Masterpiece Arms, American Precision Arms, Area 419 etc. KSS will be releasing a version(s) at a later date that supports other brake styles as well as an ELR variant for larger barrel diameters and a smaller hunting variant

The ATS is a precision machined device and proper care should be taken to protect the threaded surfaces. There is no need to separate the 2 pieces.

DO NOT Cerakote any of the threaded surfaces or the internal collar as it may cause fit issues as well as prevent the tuning weight from being able to be secured as designed. Damages caused by over tightening the set screws is not covered under warranty.


Returns will be accepted only if the device has not been used, is undamaged and in like new condition, or if ordered in the wrong specification. Buyer will be responsible for return shipping and will be credited once item is received and determined to be in 100% original condition.

Due to the liability and complexity of consumer reloading and muzzle thread variances, returns will not be accepted on used barrel tuners unless it is determined that there is a defect with the original product.