You'll probably lose a little muzzle velocity (maybe 200 FPS or so), and the aforementioned cost/time, etc. and depending if it's a factory barrel the metric thread for the brake.
I sold the original brake i hated the look of it, way to long . besides i want to run a Area419 hellfire brake on it .
velocity isnt an issue for me i run a 22" 308 in my DT SRS and get the same speeds as a 24" barrel , 155gr @ 2900fps