The JAK labeled Aftermarket Parts is a game changer. For one‚ they can make your weapon have flamethrowing capabilities. It’s a great time. However‚ for every season of Modern Warfare 3‚ Activision seems to be adding more JAK parts. For the first season of the game‚ you can get a new muzzle called the BFB. To learn how to unlock the JAK BFB muzzle attachment in Modern Warfare 3‚ follow along. Modern Warfare 3: How to unlock the JAK BFB attachment So getting the JAK muzzle is easy‚ I just wish MW3 explained it better. The first and only thing you must do is unlock Sector 21 in the Season 1 Battle Pass. To unlock the sector‚ kill 10 operators or special zombies with an SMG and only use hip fire. Meaning‚ you must not use ADS (aim down sights). It should be noted that some players have reported that the game tells them a general pre-requisite such as getting 10 zombie kills. This won’t count since they need to be special ones. So if you...