HELIOS QD ATLAS MOUNT The Helios Atlas provides a mount interface for the CGS Helios QD. This mount is designed specifically for the Helios; it secures by a taper rather than the shoulder of the suppressor. The added 0.775a ^2 of length allows the suppressor to be compatible with most muzzle devices without the use of an extension ring. SPECIFICATIONS: Weight: 1.85 oz Length Added: 0.775a ^2 Threads: 1.375-24 Specifically designed for the CGS Helios QD (Not compatible with any other suppressor) 17-4 PH H900 Compatible with short Rearden devices (FHD, Mini, SPB, RPB, R2S) Compatible with Q Cherry Bomb and Other Plan B Compatible Muzzle Mfg: Rearden Manufacturing Group Llc