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 Google Plus Share Share on Pinterest Share Send email Mail Print Print 300 Blackout3085/8-24 threadassault weaponsCustomLock NutLR308M4Muzzle BrakeTactical Modular Ultra Low ConcussionULCUltra Low Concussion