Product News & Updates Tactical Modular ULC Muzzle Brake system installed on a custom 300 Blackout March 18, 2016March 18, 2016 by innovate Share on Facebook Share Share on TwitterTweet Share on Pinterest Share Send email Mail Print Print 300 Blackout3085/8-24 threadassault weaponsCustomLock NutLR308M4Muzzle BrakeTactical Modular Ultra Low ConcussionULCUltra Low Concussion