Concussion weapons cause the bulk of their damage through sheer physical force. For whatever reason, they appear to be used almost exclusively by Decepticons. Soundwave uses a concussion blaster with its own adorable battery altmode. Horri-Bull can hit targets over twelve miles away with his. Ransack uses a high-intensity concussion blaster when he isn't eating, kicking, shredding or shocking his enemies, and Sixshot wields a pair of similarly amped-up hypersonic concussion blasters, which presumably use soundwaves to do their job.