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Having a hell of a time with my CMMG

This is a discussion on Having a hell of a time with my CMMG within the AR Talk forums, part of the Long Gun Talk category; I have a JP enterprises handguard to install on my AR CMMG upper, so I'm basically disassembling the whole upper group. The gas tube roll ...

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Old 07-22-2009, 10:42 PM   #1
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Having a hell of a time with my CMMG

I have a JP enterprises handguard to install on my AR CMMG upper, so I'm basically disassembling the whole upper group.
The gas tube roll pin came out easily and the gas tube took some effort but eventually came out of the front sight.
The first problem I ran into was the front sight taper pins. I could not get these out no matter how hard I hit the damn things... Using a perfect size punch with the barrel and sight very secure on a rock steady work bench, my father and I were smacking it as hard as we could controllably with a 3lb. hammer. Took it to the gunsmith... he tried to punch them out, but also couldn't get them to budge. So the gunsmith drilled them out and $60 later I was able to remove the front sight (also had to buy new taper pins for $6). The flash hider was pretty tight but nothing I couldn't handle.
After all that **** I now have another road block to get around. The damn barrel nut is on insanely tight. I don't exactly have an upper receiver action block (I've got one on order at the moment), I rigged one up out of some wood blocks and a very heavy vice and it holds on very well. I am using an AR-15 wrench to try and budge it loose, but it ain't happening. I'm using all the force I possibly can, and even tried hitting the wrench with a hammer. I even got the the point where the 3 prongs on the wrench are actually breaking the teeth off the barrel nut, I'm not kidding. Now I don't really care about this seeing how I won't be using that barrel nut once I have my new handguard installed, but this is ridiculous. I just want the damn thing off and I don't care how. I really don't want to take it back to the gunsmith but I think I might have to.
Judging from a few posts I've seen on Arfcom in the CMMG board, it seems that they put together their rifles super mega tight, which makes things like this a real pain in the ass. When I watch those tutorial videos from Brownells or wherever on how to install free-floating handguards it makes me SO mad when they take apart the whole upper assembly in like 2 minutes because everthing is conveniently on barely hand-tight.
So does anyone have any thoughts, comment, or recommendations?, or know if CMMG uses loctite on their barrel nuts or something?

Thanks,
Tim
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Old 07-23-2009, 12:05 AM   #2
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Quote:
Originally Posted by LateralusMan View Post
I don't exactly have an upper receiver action block (I've got one on order at the moment), I rigged one up


STOP


and wait for the tools to do the job before you bubba it up.
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Old 07-23-2009, 12:52 AM   #3
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Yeah, I know what you mean and understand what you are saying. But it doesn't change the fact that the upper receiver was in a vice, being held at a complete stand still, while I torqued the barrel nut with all my might and broke off some of the barrel nut's teeth because it is so tight. Proper tools or not, it is not coming off.
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Old 07-23-2009, 01:18 AM   #4
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a lot of people sing the praises of CMMG until they try to work on them. Tighter than heck front sight base pins and barrel nuts are common complaints.

here's one example
Does CMMG use Lock-Tite on Barrel Nuts? Or an 800lb gorilla? - AR15.COM


he ended up cutting the barrel nut off with a dremel
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Old 07-23-2009, 08:54 AM   #5
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They've either overtorqued the barrel nut or they've used Loctite. I never heard of using Loctite on a barrel nut. To the contrary, grease should be used on the receiver threads, in order to properly torque the nut.

Just wondering if the gunsmith tried heating the taper pins before drilling them out?? Could be that the taper pins were Loctited.
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Old 07-23-2009, 09:32 AM   #6
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When things are stuck on really tight I've found heat to be my best friend.
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Old 07-23-2009, 10:30 AM   #7
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Quote:
Originally Posted by Mercmar View Post
Just wondering if the gunsmith tried heating the taper pins before drilling them out?? Could be that the taper pins were Loctited.
Not sure, but I doubt it.
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Old 07-23-2009, 10:32 AM   #8
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I own a CMMG and have never been able to remove my flash hider.
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Old 07-24-2009, 08:17 AM   #9
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Not sure, but I doubt it.

Not sure that the gunsmith used heat, or not sure that the pins were Loctited? How would you possibly know if they were Loctited??
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Old 07-24-2009, 10:01 AM   #10
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Quote:
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Not sure that the gunsmith used heat, or not sure that the pins were Loctited? How would you possibly know if they were Loctited??
I'm not sure if he tried using heat...
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