The R9 9mm suppressor is capable of handling high volumes of fire and running other calibers such as .300 BLK and .308 Win. Primarily focused on suppressing 9mm (sub-machine guns and SBRs), it can also be used on a handgun with YHM's Nielsen Booster Assembly. Features 1-3/8-24 rear mounting threads, ships in 1/2-28 Direct Thread format. Fully-welded tubeless design made from 17-4 PH Stainless Steel. Limited Full Auto rated. 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