FN 509T Thread Protector
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This steel thread protector is a factory OEM accessory. This 9mm thread
protector features a black finish and is threaded 1/2x28 TPI. This
component features a textured exterior surface for better grip while
installing or removing from the barrel. Also referred to as a barrel
cap, this component is designed to protect the threads on the barrel
when a suppressor is not attached.