Carbon dummy suppressor CNC aluminium (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). How to install barrel spacers? Due to the manufacturing process, all tubes present an overlap pattern, and may not be exempt of small visual defects. ** if used in conjunction with SRS muzzle brake, proper timing is compulsory. SBA-SIL-39