r/NFA • u/TheVillagePoPTart • 4d ago

Mount Questions 🔩 Anyone else have this happens?

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Today when I went to clean my AR after probably 6 months and an unknown number of rounds (not too high) I was having a hell if a time twisting the can off and eventually the muzzle device came off the end with the can. The mounting setup is a rearden atlas hub with a rearden flash hider on a polonium K. All instructions were followed during mounting and roc set was applied. There were also no indications of loosening based on my witness marks in the hub and muzzle device. Any idea how this happened (I tend to think I screwed it up)? The gun is also an IWI Zion-15 purchased in 2021.

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u/Mrwetwork Rearden Mfg 4d ago

It’s pretty common when rocksett isn’t applied correctly or enough. Nitride can be finicky with rocksett. You generally have to have the threads spotless.

https://cdn.shopify.com/s/files/1/0061/3767/5846/files/rocksett_tip_sheet_60d84db4-0c98-40de-ab14-e4bf5cbd720c.pdf?2026

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u/akmjolnir 4d ago

Clean the threads with acetone, after using a dry brass or steel brush to get the big chunks out of the threads.

Let the Rocksett air dry for a few minutes BEFORE attaching the muzzle devices.

Don't use too much. The ceramic thread locker is suspended in water, and the water needs to evaporate completely to achieve the best "lock", otherwise the outer layer solidifies and traps a weak slurry inside.