Just make you install it properly/carefully, take the time to ensure you have good consistent FPS (air-seal with your hopup/nozzle and such)
You can buy the highest quality parts, install them improperly or have something else not functioning correctly, only to get shitty results.
It's not hard swapping out for a new barrel, but mistakes can be made and have with all things. Just make sure to read up on it, take your time and you will be golden!
Getting a chance to chrono is always a safe bet. Just because the box says X FPS, doesn't mean it is so. Could be a lot hotter, a bit, pretty close or totally far from it.
Generally you can expect 5-15 fps increase, give or take from a TBB.
Best of luck!
Last edited by Forever_kaos; January 26th, 2013 at 12:56..