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Discussion Starter · #1 ·
What part of the weapon do you put into a vise to remove the factory flash hider? Do you grip the barrel or the receiver? The barrel seems like the obvious choice, but there isn't much to grab on to. Putting the receiver in the vice seems like it could put too much pressure on the base of the barrel.

I bought an aftermarket flash hider and don't want to mess up.
 

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I am not speaking from experience, but if it were me I would use the wrench flats on the barrel, where it meets the receiver.
 

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you're going to want to be REALLY careful doing this so that you don't de-index your barrel or damage your receiver.
 

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Oregonian said:
Putting the receiver in the vice seems like it could put too much pressure on the base of the barrel.
...you should not ever use a vice unless you can grip the reciever by the trunion area "only"...ie ...up front...you can easily deform the reciever otherwise...

...if your flash suppressor is stubborn... use some penetrant like WD 40...or even Breakfree CLP...let soak into the treads and then heat it up a little...it should come off...if not...use two tight fitting wrenches...one on the suppressor flats and the other on the barrel flats to counteract the force applied to the flash suppressor flats...

...torque down the new flash suppressor to about 15-20 foot pounds...nice and snug and then about another 1/8 to a 1/4 of a turn if using a crush washer...
 

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Removal

I agree with the no vice grips or any grips for that matter to the barrel. I put on a MFI fake silencer (looks are what it's all about...I've realized that the 556 will never kill a zombie and I'm ok with that), and I put a leg lock on the 556 while using the wrench on the flash suppressor.
 

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ullie said:
Oregonian said:
Putting the receiver in the vice seems like it could put too much pressure on the base of the barrel.
...you should not ever use a vice unless you can grip the reciever by the trunion area "only"...ie ...up front...you can easily deform the reciever otherwise...

...if your flash suppressor is stubborn... use some penetrant like WD 40...or even Breakfree CLP...let soak into the treads and then heat it up a little...it should come off...if not...use two tight fitting wrenches...one on the suppressor flats and the other on the barrel flats to counteract the force applied to the flash suppressor flats...

...torque down the new flash suppressor to about 15-20 foot pounds...nice and snug and then about another 1/8 to a 1/4 of a turn if using a crush washer...
...take a foot long (or longer) steel rod and run it through the vents of the flash suppressor to give you some leverage...use something like Breakfree CLP as a penetrant and lubricant and apply heat...don't burn off the CLP...

...be sure to use a wrench on the barrel flats to counteract the force you use to remove the flash suppressor...
 

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Oh for Jesus! What in the stupid hell are you guys going! The remove and replace the flash suppressor in a SIG 556, you do it the same way you would remove and replace a flash suppressor on a AR 15.

1.Remove the upper receiver from the lower receiver
2.Field strip the upper receiver and remove the hand guards
3.Place the barrel of the stripped upper receiver’s barrel into a bench vice that is equipped with aluminum AR 15 type barrel blocks. Tighten the vice.
4.Take the appropriate sized wrench and affix it to the flats on the flash suppressor, and turn it counter-clock wise (left) to loosen and remove the flash suppressor.
5.Replace the removed flash suppressor with the new one of your choice by following these steps in reverse order.

For the love of %$%&&*%$! :roll:
 

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flash hider removal

I just put on a MFI 552 style flash hider on my 556 10' barrel and it was a bugger to get off. I used a propane torch to get it free. Looks great now. I followed MFI's website instructions, similar to Ullies, and it worked. I would like to see some pic's of the new flash hiders to see how they look...
 
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