To use this device, you simply remove the existing Uzi barrel nut, then install this adapter in place of the old barrel nut. This will provide threads to attach the silencer at this point. This device is backwards compatible with the Mystic and Infiniti silencers as well.
Please note that this part does not fit the Micro Uzi, as the barrel nut interface / thread sizing is different. It does work fine on standard Uzi’s, and on mini Uzi’s.