Weapon Tuning is a brand-new system introduced in Call of Duty: Modern Warfare 2. With its help, you will be able to take the Weapon Customization aspect of Call of Duty: Modern Warfare (2022) to a whole new level, especially those of you who want to have control over every single aspect of your weapons. In this Call of Duty: Modern Warfare 2 guide, we have provided a complete breakdown of the new Weapon Tuning System.
First of all, how do you get access to Weapon Tuning to start min-maxing your weapons? This can be done by attaining Max Level with a Gunsmithable Weapon. After that is done, you will be able to click on the (Tune) button to get started with the end-game customization that Infinity Ward has to offer.
Weapon Tuning in Call of Duty: Modern Warfare (2022) should allow you to min-max a particular weapon with the help of a radar graph. The said graph will show the efficiency of your customized weapon in a few different areas i.e., Damage, Fire Rate, Range, Accuracy, Recoil, Mobility, and Handling. The screenshot shared should help you understand it a little better:

As you play around with different Weapon Attachments, the graph will also shift to reflect the changes. In addition to all that, you will also see 2 sliders on the screen. These sliders can be adjusted to get what you want from that particular weapon i.e., Aim Walking Speed, ADS Speed, Recoil Stabilization, and Aiming Idle Stability. It is needless to say but going all-in on one stat will cause the other stats to take a massive hit.
Therefore, you will need to come up with a combination that will make your weapon truly unique.
We hope this helped you understand Weapon Tuning in Call of Duty: Modern Warfare 2 a little more. You can also check out our detailed Call of Duty: Modern Warfare (2022) wiki page for more tips and strategies.