5/8x24 Thread Protector, Short (0.56" L x 0.8" OD)

thingiverse

I designed this specifically for my own rifle, hence its somewhat unusual length. If you need a longer version, I can easily extend it. When printing, I set parameters to eliminate infill entirely. This thread protector won't withstand high heat from rapid firing, but its primary function is to safeguard your rifle's threads against bumps while it's stored in a safe or during transit – essentially the only times it won't have a suppressor attached.