CZ USA P-O9 F NOCTURNE SR 9MM LUGER SEMI-AUTO HANDGUN The Suppressor-Ready (SR) version of the full-size comes with a 1/2" A- 28 UNEF - 3A threaded barrel for quick and easy mounting of a suppressor. High performance doesn't need to raise its voice. FEATURES Hammer fired mechanism: DA/SA operation; SA 4.7 lbs DA 9.9A 0.5 lbs Modularity: User-swappable safety and decocking levers Material: Durable, fiberglass-reinforced polymer frame. Mfg: Cz Usa