Overhaul or modification of a gun are changes made to improve the performance, functionality or other features of an existing gun. Such revisions may include different components such as the firing mechanism, barrel, magazine, trigger, stock or accessories.

Revisions are often custom jobs preferred by individual gun owners or professional shooters. This may be done for purposes such as improving the gun’s trigger response, upgrading the sights, reducing recoil, or adding a larger capacity magazine. Revisions may also be made to make the weapon better suited to the user or optimized for a specific purpose.

However, it is extremely important to comply with local laws, regulations and gun safety issues when making a gun overhaul or modification. Laws and regulations may vary between countries and even states, so if you are considering modifying your gun in any way, it is important to contact your local authorities to learn the relevant rules and regulations.