Gemtech GM-9 Threaded Rear Mount Adapter Features The Gemtech GM-9 Threaded Rear Mount Adapter is designed specifically for use with the Gemtech GM-9 and MULTIMOUNT suppressors providing a threaded rear mount adapter that connects the suppressor to fixed-barrel carbine and SMG hosts in a secure concentric interface. The 5/8x24 thread pattern accommodates .300 Whisper and .300 Blackout fixed-barrel carbines and the adapter s design ensures proper suppressor alignment and consistent point-of-impact retention across installations. Important note: the 5/8x24 mount is rated for subsonic ammunition only on .300 Whisper and .300 Blackout platforms. The black finish provides corrosion resistance and a low-profile appearance consistent with standard suppressor accessory equipment. Compatible with both the GM-9 and MULTIMOUNT suppressor systems this adapter provides factory-correct thread mount capability across two of Gemtech s suppressor platforms in a single adapter. For Gemtech GM-9 and MULTIMOUNT owners running .300 Whisper or .300 Blackout fixed-barrel hosts with subsonic loads this adapter provides the correct factory-spec mounting solution. Gemtech GM-9 Threaded Rear Mount Adapter Specifications Manufacturer: Gemtech Model: GM-9 Threaded Rear Mount Adapter Thread Pattern: 5/8x24 Color: Black Compatible With: Gemtech GM-9 Gemtech MULTIMOUNT Firearm Fit: Fixed Barrel Carbines SMGs Compatible Calibers: .300 Whisper .300 Blackout Note: Subsonic Ammunition Only