Gemtech Threaded Rear Mount Adaptor for GM-45/LUNAR-45 1/2-28 Thread 75D5B9FF MO. These allow the use of the suppressor on Fixed barreled weapons. Features of Gemtech Threaded Rear Mount Adaptor for GM-45/LUNAR-45 1/2-28 Thread: Threaded end cap adapters for use with the GM-45 and Blackside suppressors Allow the use of the suppressor on fixed barreled weapons Package Contents: Gemtech Threaded Rear Mount Adaptor for GM-45/LUNAR-45 1/2-28 Thread Threaded End Cap adapters for use with the GM-45 and Blackside suppressors. These allow the use of the suppressor on Fixed barreled weapons. MO12196