The Advanced Armament Halcyon: The new Halcyon from AAC is everything you want from a rimfire silencer and nothing you don't. Go from long to short configurations in seconds, and easily disassemble without any tools required. No smoke, no mirrors, no unfounded claims - best in class, period. Overbuilt for maximum performance and durability without the excess weight Features indexed, shielded Titanium K-baffles Modular design is 22 LR full-auto rated, 5.7 rated