Match Grade Machine made my contender barrel. If I had it to do over again I would of just had a 17 Hornady Hornet made instead of the Ackley. Noise difference between the Hornet and Fireball in contenders is pretty noticeable. The fireball is a bit louder and higher pressure to. If you were to get a suppressor for the fireball it would have to be a 5.56/223 or larger rated can. With the hornet a lot of the 22 rim fire cans are rated for 22 hornet and 5.7x28.