Q LLC ACC-E9-MOUNT-1/2-28 Erect9r 9mm 1/2-28 Direct MountThis product from Q LLC is called the Erect9r 9mm 1/2-28 Direct Mount identified by the code ACC-E9-MOUNT-1/2-28. Q LLCACC-E9-MOUNT-1/2-28 appears to be a mount designed for the Erector 9mm suppressor or a similar product. The "1/2-28" likely indicates the threading size suggesting compatibility with firearms that have a barrel threaded with a 1/2-28 pitch. This mount is likely used for attaching the suppressor to the firearm providing a direct connection.This mount is made for people that want to run their ERECT9R on a fixed barrel firearm.Specifications1/2-28" Direct Thread17-4 Stainless SteelHead Treated1.12 Oz