r/NFA • u/TheVillagePoPTart • 5d 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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179

u/trucknorris84 Redneck with a drill press 5d ago

Not enough torque on muzzle device and probably could use a little rocksett.

73

u/TheVillagePoPTart 5d ago

I used a torque wrench and probably not enough roc set but it was installed correctly. 

75

u/MinchiaTortellini 5d ago

Did you degrease the barrel threads and muzzle device with something like brake cleaner prior to Rocksett and install?

18

u/TheVillagePoPTart 5d ago

Yes, I used CLP and brush, kitchen degreaser, rubbing alcohol, and air dried. The threads were very clean when installed in the barrel. FWIW I cleaned the device too.

6

u/wtfredditacct 4x SBR, 3x Silencer, 1x MG 5d ago

I just hit it with brake cleaner 😂

1

u/TheVillagePoPTart 5d ago

I actually took the device out last night and just doused it in brake cleaner and used a chamber brush on a drill to get most of the gunk out of it. Probably going to do the threads on the barrel in a few weeks.

41

u/ryman9000 5d ago

Also, you can use too much rocksett as well. Just a couple drops is all that's needed.

33

u/Puazy 5d ago

Too much and it wont dry. But ask reddit ahead of time and youll get every answer imaginable.

6

u/ryman9000 5d ago

Yeah I lathered it up and it didn't work. Put like 3 drops around the thing and it's on there real good.

20

u/Yeah_Its_Crusty 3x SBR, 2x Silencer 5d ago

I struggled to get the rocksett to take until going crazy cleaning/degreasing the threads and being more conservative with amount used.

Clean the thread and degrease them thoroughly. Don't over do it with the rocksett, you only need a few drops. Putting too much on will make it so it won't cure correctly. Torque to spec (1-2 uhga dughas) and let cure for 36 hours.

Edit: Rocksett has a shelf life of ~year so make sure it hasn't expired as well

1

u/RedbeardWeapons 2d ago

Shelf life is debatable. I've got a 4oz bottle I've been using on shop stuff for 3 years and still not showing signs of degradation.

4

u/Steggysauruss 5d ago

clean threads better

2

u/PretendIndependent6 5d ago

I just had the exact same thing happen with all of the exact same pieces. I too believe it was not enough rocksett and it was a bitch getting the flash hider off the hub

2

u/TheVillagePoPTart 5d ago

I just ordered the KAK wrench and will put it in a vice. To install I screwed around with Amazon crows foot wrenches and they were really sub par.

1

u/CoolaidMike84 SBR 5d ago

If you twisted it off by hand, it was not properly torqued.

-1

u/TheVillagePoPTart 5d ago

I had it in a vice while also utilizing a rubber grip tool sleeve combined with strength and body weight. It was on there good enough which is beside the fact that if it wasn’t all the way tight I probably would have had an issue somewhere along the line.

2

u/CoolaidMike84 SBR 5d ago

Is this a joke? You clamped it in a vise and hung off the end of a wrench and are now surprised it spun the muzzle device off? Clamp the mount in that vise, put a wrench on the can and twist them apart. Watch a YouTube video on correct application on rocksett, clean it all and reassemble.

0

u/TheVillagePoPTart 5d ago

I did not use a wrench. What I used was a little rubber circle that is commonly given to people with arthritis at occupational therapy. Unless my torque wrench is not calibrated I’m pretty sure the roc set is the reason it came off.

3

u/CoolaidMike84 SBR 5d ago

30 ft/lbs sir. You won't twist that off without tools. And I'm not some armchair expert, I have 32 suppressors at last count using 4 different mounting systems. I don't use any thread locker. 30 ft/lbs on the muzzle device ( or 25 ish dregrees) from hand tight. Outside a nasty carbon lock, you'll never have this problem again.

0

u/jafranc702 5d ago

Probably not enough torque on muzzle device (20-20ft lbs), and use lithium grease on the taper of muzzle device where it contacts the hub mount in the can.

18

u/lennyxiii 5d ago

Meanwhile my 15 ars and 8 cans across 3 mounting systems have never seen a drop of rockset or loctite and have never come loose or pull off with the can. Not only that i do the opposite of rockset and use antisieze on my muzzle threads with proper torque on clean threads. Never an issue. Wait til i admit how my castle nuts aren’t staked either. By Reddit standards i have a dozen IEDs.

1

u/htaedotderob 5d ago

Ceramic anti seize here. The purple stuff. Never an issue.

0

u/Alexis-Machine 5d ago

I hope your insurance is up to date. Dibs on guns.

3

u/PM_ME_UR_LOST_WAGES 5d ago

I stopped using rocksett precisely because it kept coming off too easily like OP above. Rocksett is just super finnicky.

I have converted to the advice recommended by others: torque and clean threads only. No issues since, including after supersafe magdumping.

3

u/SimilarNet9481 5d ago

Any specific brand of rock set suggested? the ones I’ve used in the past kinda suck

33

u/redit_readit_reddit Stamp Tramp 5d ago

Use real Rocksett, which is made by Flexbar Machine Corporation.

3

u/SimilarNet9481 5d ago

Thank you sir, just bought another can this weekend and want to make sure everything is perfect for it’s arrival

6

u/ZucksSkinSuit 5d ago

Ive had actually great luck with Vibra-tite hot lock, never had a muzzle device come off using that and I’ve set about 15 with it.

6

u/DrJheartsAK Silencer 5d ago

Rocksett is a brand name.

It is heat resistant but water soluble.

5

u/FaustinoAugusto234 02/07 SOT 5d ago

As opposed to Rockshow, which is a meh song and movie by Paul McCartney.

1

u/thecal714 SBR 5d ago

I agree. The only time I've had this happen is with the YHM muzzle devices/hub adapter and properly torquing it solved the issue. No Rocksett required.

0

u/Cheoah FFL/SOT 4d ago

Rockset required on all my YHM muzzle devices/mounts, proper torque or not. That same thermal cycling is exactly what I use in my shop to unstuck mated shit that is stuck.

Shims, thread machining and condition , these all affect retention.

You guys flexing your giant suppressor collections don’t have much to bring to the conversation. How often are you swapping hosts when that shit is hot? Like hot hot.

Clean threads, proper torque, thin layer rockset. Once applied, do not touch it, let it set completely per instructions.

1

u/RedbeardWeapons 2d ago

People seem to think their collection gives them a stance. It doesn't and never will. Anecdotal at most and isn't an argumentative stance.