The .223/5.56mm Silencers can significantly reduce muzzle blast in shorter 7-14" barrel rifles and pistols, but they won't be "Quiet," Especially with the shorter K or Mini configurations. They will, however, significantly decrease the possibility of hearing damage. Compared to an un-suppressed rifle, they reduce the DBs by approximately 30 DBs. The performance is increased when used on 16" barrels and longer semi-auto rifles, and further performance is seen on bolt action or single-shot rifles. Call Oakland Tactical for a free consultation of your needs.