RobCo 16 Posted March 1, 2022 I am currently building an AR in 300 AAC Blackout and I am looking for a muzzle break. Since the difference between 5.56 and 300 AAC blackout is the barrel. Do I use a muzzle break for 30 caliber? Since the cartridge is 7.62 x 35 Quote Share this post Link to post Share on other sites
Krdshrk 3,872 Posted March 1, 2022 You need a .30 caliber brake for sure. VG6 has the VG6 Precision Gamma 300BLK muzzle brake. Just make sure your barrel is 5/8x24 RH threaded. Quote Share this post Link to post Share on other sites