easiest way is to take it to a gunsmith who can remove the barrel, thread the end of the barrel, and add a break. Figure roughly $100 for the break and the same for labor. And then figure $150 to $800 for electronic hearing protection.

It's gonna be LOUD, bro. Most guides hate breaks. If you are having problems with sight-in and range testing, you might be better served with a lead sled. You won't even feel the recoil firing a round while hunting.