Breaking bbl nut free...

[CRTguns]

Another trick... drip Kroil under the nut. Then torch it. When the kroil is boiling out the crack and smoking (over 300 degreees) you can be sure you've melted any locktite that might be in there.

[saki302]

Use this:

http://geissele.com/reactionrod.aspx

Steel on steel.

A friend of mine had some horrendously tight pins on his gas block- I used a stout punch (Starrett), and a 4lb sledge. I got them off, but he bought me a new punch

-Dave

[ExtremeX]

Another trick... drip Kroil under the nut.

I always hear about that stuff... I've been told its magical.

Ill have to get some and try it.

[kcstott]

Use this:

http://geissele.com/reactionrod.aspx

Steel on steel.

A friend of mine had some horrendously tight pins on his gas block- I used a stout punch (Starrett), and a 4lb sledge. I got them off, but he bought me a new punch

-Dave

I have one of those in the bottom of my tool box

[saki302]

I have one of those in the bottom of my tool box

It's such an awesome tool- Brownells makes their own now too for around $40. They can also work on other rifles which have similar barrel extensions as AR15s. GREAT for holding a barrel to swap muzzle devices.

-Dave

[brassburnz]

I have a plastic upper receiver clamp for removing and installing AR barrels, but I had one I could not budge. I had back surgery a couple of years ago and just don't have the upper body strength. I took my upper receiver to Randall and he popped that barrel nut loose in a couple of seconds. Randall is the man!

I'm betting on him not having a proper way to hold the receiver.
I have a pair of PRI aluminum receiver blocks that I use on stubborn uppers.
The receiver gets clamped in the kurt vise.
KC will know what the kurt vise is likely bolted to.
Then I have a 3ft long cheater pipe that removes ALL barrel nuts without any receiver damage...

I have taken apart a few adams arms uppers without any issues.

[ar15barrels]

Use this:

http://geissele.com/reactionrod.aspx

Steel on steel.

Those tools that hold the barrel extension cause all the force of the barrel nut unthreading to bear against the index pin because the friction between the barrel nut and receiver is what makes the nut hard to remove.

There is likely MORE friction between the barrel nut and receiver at the threads than there is between the barrel nut and the front of the barrel extension flange.
That means that if you hold the barrel extension to loosen a barrel nut, you are transmitting MORE torque through the barrel index pin than if you held the receiver...

Either way you do the job (holding the receiver or holding the barrel), the pin is going to take some torque.
There is no way around that.

[ar15barrels]

I have one of those in the bottom of my tool box

That's the best place to keep it.
Makes it harder to accidentally use it...

[ar15barrels]

GREAT for holding a barrel to swap muzzle devices.

That's the only job I would use one for.

[SonofWWIIDI]

Kroil was mentioned, what about break free or some other type of penetrating oil?

[saki302]

That's the only job I would use one for.

That's why I bought mine- some of the barrel vise blocks can mark up the barrels, or smear aluminum into the Parkerizing.

What do you think of the upper clamps which hold the picatinny rails? I thought of getting one, but it seems like a small spot to put a torque load.

-Dave

[6mmintl]

Im assuming you removed the gas tube first?