Aftermarket barrels for your Glock 43/43X firearm include ported, threaded, and flush, each with its own distinct design. Choosing the right type of barrel often depends on the intended purpose of the firearm. For example, flush barrels are even with the end of a firearm’s slide or frame, making them a great choice for concealed carry. Ported barrels, however, have holes or slots cut into the top of the barrel and sometimes through the slide to allow gases to escape vertically, reducing recoil and muzzle rise.