If you want to mount any 1/2x28 TPI threaded accessories on your Colt / Umarex M4 .22LR rifle, such as a suppressor, a flash hider, or a fake suppressor, this is the part that you need. This thread adapter easily replaces the factory flash hider and provides the external male 1/2x28 thread. The adapter is specifically engineered to provide the required shoulder to ensure that your suppressor is correctly aligned when screwed on to the adapter.
The Colt / Umarex M4 .22 LR Thread Adapter is CNC manufactured to precision tolerances from solid steel rod in one CNC lathe operation to ensure exact thread alignment and are hot salt blued to match your Colt / Umarex M4 .22 LR rifle. Each retail packaged adapter assembly consists of one adapter and one knurled OD thread protector.