These protectors are designed to fit standard 1/2-28 male threads. Install each time your silencer is not in use to protect your barrel threads. This package contains 3 of our 1/2-28 Standard Thread Protectors.
Material: High-Quality Carbon Steel (Black)
For MORE Material Options:
Stainless Steel-Black: N/A
Stainless Steel-Raw: TP-3P-528-S
Please contact the manufacture of your firearm or review your firearms manual to identify the threads of your barrel.
Just buy the three pak 
