Do not under any circumstances get a Flatline barrel. Ever. A Boomstick is an excellent barrel but a bit pricey to put on a M98 because likely you'll want to move up and that's a bit much to have sunk into your first gun. Personally I recommend the Custom Products 1 piece barrel, which is superbly accurate, quite reasonably quiet, and a superb value. In fact, there's nothing out there substantially cheaper, and it outshoots everything in its price range and many barrels that are more expensive. Plus they come in a variety of colors at no extra charge. You can view them at
www.customproducts-az.com and purchase them from a variety of stores. Dale Ford of Paintballchannel.com sells them for probably the best price to be found, and usually can have it shipped to you in 3 days. It's hard if not impossible to beat that.