The AAC Halcyon is a revolutionary new rimfire silencer. Everything you want from a rimfire silencer and nothing you don’t. Over built without the weight. Indexed shielded Titanium K baffles, modular, 22lr full auto rated, 5.7 rated. Interchangeable rear end cap threads. Go from long to short in seconds and easily disassembled with out any tools required. No smoke, no mirrors, no unfounded claims just best in class.