ATM is correct. Replacing the factory hammer (hammer only) with a VQ hammer will bring you down to about 2.5 lbs. It's the first mod "required" on every 10/22.
https://www.volquartsen.com/products/201-target-hammer-for-10-22-and-10-22-magnum
https://www.volquartsen.com/products/201-target-hammer-for-10-22-and-10-22-magnum