FSN-K Muzzle Brakes??

Boomer686

Boomer686

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Just to be certain... did I read here somewhere that muzzle brakes on these models do not thread on / attach the same as the longer barreled VZ/CZ 858's etc? I 'm looking to install a Heavy Brake (maybe a Crusader) on the K model WHEN & IF marstar ever get's them back in stock.

Can someone clarify this for me?

Regards,
 
They thread on same as the rest of the VZ's.

The difference is they don't have the spring-detent in the front sight base to index or retain them. The K's have a set screw threaded into the flash suppressor.
 
So barring a set screw we can make do with a modified crush washer of sorts like on the AR's?

I'm guessing it would be next to impossible to have these indexed from Neit etc as the threads are probably not indexed the same on all the barrels???

Regards,
 
Boomer686 said:
So barring a set screw we can make do with a modified crush washer of sorts like on the AR's?
Click to expand...

That's why I asked about how it bottoms out. If there's a shoulder, you can use a crush washer. If not, then you'd need a set screw or jam nut to index it.

Hey, I just solved your problem. Use a regular VZ thread protector (or thin slice of one) as a jam nut. Loc-tite it up and you should be able to index a brake nicely, provided there's enough thread on the muzzle for both.

Boomer686 said:
I'm guessing it would be next to impossible to have these indexed from Neit etc as the threads are probably not indexed the same on all the barrels???

Regards,
Click to expand...

I'd guess that too.

Edit:
Found this pic. Looks like all you need is a crush washer with the proper ID, or shims of the proper ID, to index a brake. It doesn't have much of a shoulder so that could be tricky. A thread protector ground down to the proper length might be a better option.

IMG00021-20110124-0005.jpg
 
WHEN & IF the K's show up at Marstar again :( I'll try my hand with a modified crush washer as it would seem to be the easiest route. I know a couple guys who are pretty handy in the shop ;) .

I really don't think there would be enough thread for using a shaved thread protector as a jam nut and a brake.. or least not enough bite for my liking anyway.


Thanks for the help.

Regards,
 
Stevo said:
Hey, I just solved your problem. Use a regular VZ thread protector (or thin slice of one) as a jam nut. Loc-tite it up and you should be able to index a brake nicely, provided there's enough thread on the muzzle for both.
Click to expand...

Good idea Stevo. You may find that this method may give inconsistent results when using one of the better designed flash hiders though, especially if there are threads etc exposed on the device because you cant tighten the flash hider all the way down.
 
Yep Stevo they do. Also sometimes when I put down the pipe I might be right.
:onCrack:
Naa...
As for the lock washer idea it is a total pain in the back side to make it index the muzzle break due to the taking on & off pain in the back side. As you need to make sure to have enough "meat" on the threads not to cause other issues.
Also ridgearms you don't want to run too many rounds threw your barrel with out something between the muzzle device and the shoulder of the barrel.
 
Satain said:
Yep Stevo they do. Also sometimes when I put down the pipe I might be right.
:onCrack:
Click to expand...


Well, Satain, thanks for your input, but I was asking Farmboy about the crush washers he has in stock.

It's not like you put any details in your helpful post. If it's a standard AR crush washer, then say so.

Satain said:
Also make sure to buy a crush washer and index it properly. Then you should be golden.
;)
Click to expand...
 
I've simply used the yellow teflon tape to get it to index.

Been meaning to get a crush washer...however it seems that 'Oldtimers' has set in as that was over a year and a half ago.

Thank you aluminum canteen cup...aluminum pot set...aluminum flying kitchen griddle...
 
Last edited:
ridgearms said:
Why is that?
Click to expand...
First of all the crush washer will allow you to properly index your muzzle device. Over time the yellow Teflon tape begins to break down and thus allowing the "torquing" action that the muzzle break produces to throw it out of alignment and could cause some funky stuff to happen to your barrel or brake & your threading on the barrel. Never mind the muzzle break no longer producing the effect it was intended for due to it being out of index. Also by installing a crush washer over the yellow tape alone, it will correct these two problems and also doesn't emit the awful fumes that occur when yellow Teflon tape starts to melt. Hence why on the CZ/VZ & AK platforms you will notice the detent there to stop the rotation of 1's muzzle device.
Now if you will excuse me my pipe is getting cold :p
 
Satain said:
First of all the crush washer will allow you to properly index your muzzle device. Over time the yellow Teflon tape begins to break down and thus allowing the "torquing" action that the muzzle break produces to throw it out of alignment and could cause some funky stuff to happen to your barrel or brake & your threading on the barrel. Never mind the muzzle break no longer producing the effect it was intended for due to it being out of index.
Click to expand...

Never knew that, and thank you for the info!
 
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