Carbon dummy suppressor CNC aluminum (6000 series) base and head (with Oring compression attachment), Carbon fiber body (1.5mm) thickness .-24mm CW thread-Outer Diameter: 40mm-Inner Diameter: 37mm-Length : 300mm-Weight: 170 Grams-2 barrels spacers (NBR material, 37mm)-10 open cells acoustic foam insert rings (5 small, 5 large)*This suppressor muzzle attachment system by compression Oring allows the installation of barrel spacer to use this item as a barrel extension (SBA-BBS-09 and SBA-BBS-12).