The GEMTECH Threaded Rear Mount Adaptor is designed to enhance compatibility with GM-9 and MULTIMOUNT suppressors by providing a precise 5/8-24 threaded endcap adaptor for fixed-barrel carbines and SMGs, enabling secure attachment and streamlined performance. This adapter is specifically configured for use with .300 Whisper and .300 Blackout carbines employing SUBSONIC AMMO ONLY, ensuring optimized backpressure management and improved sound reduction for suppressed operation. When paired with these configurations, users can expect reliable mounting and consistent alignment, contributing to reduced recoil and enhanced accuracy across varied shooting scenarios. Note that most handguns require Gemtechs LID mount for proper function, a consideration that helps ensure compatibility and dependable cycling when transitioning between platform types. The adaptor integrates seamlessly with the GM-9 and MULTIMOUNT families, leveraging GEMTECHs engineering to maintain durable performance under demanding use while keeping a compact footprint. Ideal for hunters and precision shooters who prioritize quiet, controlled shots, this rear mount adaptor supports a versatile approach to suppressed shooting with compatible .30 caliber carbines, delivering a clean, cohesive mounting solution that preserves efficiency and reliability.