CC Iur flash hider rockset???

[Sinasta]

Took one off one of the new MRR's...just clamped the upper lightly in a visa and it popped off
Easliy with a wrench.

I really hope you're not doing that. Use a proper clamp/vice to isolate the barrel from twisting the upper receiver such as a Magpul Bevblock that holds into the barrel extension or soft jaw vice the barrel.

 

[Dsiwy]

Taken off hundreds of flash suppressors by just clamp the upper, no wear or damage at all

 

[panzerblaster]

That sounds like a reason / red flag to avoid the smith.

 

[greentips]

I really hope you're not doing that. Use a proper clamp/vice to isolate the barrel from twisting the upper receiver such as a Magpul Bevblock that holds into the barrel extension or soft jaw vice the barrel.

Clamping the upper is not preferred but it has been done million times before the reaction rod and then the Bevblock....because it is the most convenient, especially when a non-standard length free floating hand guard is installed. Since there is a receiver clamp shell block available for installing barrel, people just use it to install muzzle device in one go.

The normal 15-18 ft lb should not snap the index pin or anything else, unless the barrel nut is loose and the pin walks out of the slot and wreck the extension.

But the barrel pin is not designed to take stress, even it will take the torque, it is not what it is supposed to do.

Hence, in the original M4/M16A2 manual, barrel installation and muzzle device installation are done with a barrel vice block.

On the other hand, if the muzzle device is so stuck on the barrel, the bevblock/reaction rod may loosen up the barrel exertion if it goes over 100 to 150 ft-lb. That depends how the barrel manufacturer puts the barrel and barrel extension together. If you have a ####ty barrel manufacturer who did a crappy job ( it has happened ), the barrel will get unscrewed.

 

[bsand]

Yep gunsmith called and said he got the brake off and new on haha... now for me to make time to pick it up..

 

[Sinasta]

Clamping the upper is not preferred but it has been done million times before the reaction rod and then the Bevblock....because it is the most convenient, especially when a non-standard length free floating hand guard is installed. Since there is a receiver clamp shell block available for installing barrel, people just use it to install muzzle device in one go.

The normal 15-18 ft lb should not snap the index pin or anything else, unless the barrel nut is loose and the pin walks out of the slot and wreck the extension.

But the barrel pin is not designed to take stress, even it will take the torque, it is not what it is supposed to do.

Hence, in the original M4/M16A2 manual, barrel installation and muzzle device installation are done with a barrel vice block.

On the other hand, if the muzzle device is so stuck on the barrel, the bevblock/reaction rod may loosen up the barrel exertion if it goes over 100 to 150 ft-lb. That depends how the barrel manufacturer puts the barrel and barrel extension together. If you have a ####ty barrel manufacturer who did a crappy job ( it has happened ), the barrel will get unscrewed.

Yup it has been done a million times before. But it is not the correct or preferred method. As you said, in the original manual it says to use a barrel vice block.

 

[Dietz]

I like to use the FSB when it's there.

 

[bsand]

Finally got ot pick up my rifle today, looks like it was just really really carbon'd on there. The gunsmith swears there was more on there than just a crush washer.

 

[SA85M1]

I like the factory supplied item,any particular reason you are changing it out?...advantages in doing so,?..

 

[bsand]

Quicker follow up shot for tac rifle. I wanted a big vented bastard brake.

 

[-[Crosshair]-]

Finally got ot pick up my rifle today, looks like it was just really really carbon'd on there. The gunsmith swears there was more on there than just a crush washer.

Colt Canada only puts a crush washer so there was nothing more.