This is a Jarvis threaded barrel 10x1 w/thread protector for an FN 5.7 pistol. Also including a Tornado Technologies 10mmx1 to 1/2-28 thread adapter. This is a perfect combo to run a suppressor on your FN 5.7 pistol. It was installed for fit and function,but never fired. This was purchased for a suppressor that never arrived. Thanks, my loss is your gain.
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