The SilencerCo Spectre 9 is completely constructed from titanium for pistol and subgun platforms. Extremely lightweight and compact for minimal impact. Compatible with 9MM and subsonic 300 BLK (full auto subs and semi auto supers). Full-auto rated, one of the few suppressors that can run on a full-auto Glock. Compatible with SilencerCo Alpha accessories and mounting systems. Ships with Spectre Piston Housing Assembly. Note: If this product is reflected as in-stock it means it's either physically in-stock or allocated and available (serial number is assigned) at my distributor