CALIBER 9MM to 45 ACP & 300 BLK Subsonic – ACCESSORIES Pistons & Fixed Barrel Spacer – WEIGHT 9.2 oz – LENGTH 7.90 – DIAMETER 1.30 X 1.75 – MATERIALS Aluminum & 17-4 SS – 9MM 128.9 dB – 300 BLK SUB 131.3 dB – 45 ACP 130.4 dB – Features – Eccentric offset design allows use of most factory pistol sights. – Easy indexing button feature ensures correct and repeatable orientation on any host. – Industry-leading sound reduction. – Pistons are available for common thread pitches and are interchangeable with the Omega 36M Hybrid 46M Hybrid 46 Octane Series and Omega K Series. – Can be shot wet by using 5cc of water or wire pulling gel.