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3/20/2017 5:03:23 PM
Posted: 6/20/2012 2:50:27 PM EDT
[Last Edit: 6/20/2012 2:51:09 PM EDT by QwikKotaTx]
Mega Ma-Ten Upper
Armalite NM Stainless Barrel
DPMS Free Float Tube

I have gotten the FF tube decently tight with a strap wrench but am unable to move it the next 1° or so required to allow for the gas tube to feed through. I broke a Husky strap wrench and also tried a fabric oil filter type strap wrench that use a 1/2" ratchet, no luck. DPMS makes a tool with two allen screws that engage the rear holes but I don't think the tool will work due to the large size of the upper. This is a two piece tube that has the same holes on the inner area that I can engage with a wrench but I am unable to separate the two halves, even with a heat gun. Ideas?


Link Posted: 6/20/2012 2:54:11 PM EDT
Magnets??
Link Posted: 6/20/2012 2:55:37 PM EDT
The FF tube should come off so you can gain access to the front of the nut.

Correct?
Link Posted: 6/20/2012 2:56:30 PM EDT
Try wrapping your tube with leather and tape and using the pipe wrench? Did you use moly grease on the barrel nut threads?
Link Posted: 6/20/2012 2:56:50 PM EDT
Originally Posted By VRMN8R:
The FF tube should come off so you can gain access to the front of the nut.

Correct?


Yes, but this was off of a built rifle so I think the two halves are locktited together. It's not budging even with a pipe wrench over some rubber.
Link Posted: 6/20/2012 2:57:38 PM EDT
take it/send it a smith so I does not get fucked up, for $500 Alex?
Link Posted: 6/20/2012 2:58:14 PM EDT
You could use a MAP (plumbers propane torch) and heat the tube some.
Dont get crazy with the direct flame.

It may have been loctited on
Link Posted: 6/20/2012 2:58:21 PM EDT

You may need some heat to soften the locking agent.

Originally Posted By QwikKotaTx:
Originally Posted By VRMN8R:
The FF tube should come off so you can gain access to the front of the nut.

Correct?


Yes, but this was off of a built rifle so I think the two halves are locktited together. It's not budging even with a pipe wrench over some rubber.


Link Posted: 6/20/2012 2:59:00 PM EDT
[Last Edit: 6/20/2012 3:02:19 PM EDT by TrojanMan]
Post your location and I'm almost certain there's an ARFCOMer in your area with a proper upper receiver block, armorer's tool, and torque wrench.

The way you're doing it is... very redneck.


If you absolutely must continue as you are, use the "snug three times" technique. Back the nut out about a quarter turn, then snug it up again, and repeat once more and everything should line up. Of course, the FF tube will then be at the incorrect angle of rotation, but at least you'll have a shootable rifle.

ETA: Red Loctite releases at 450*F, FYI, in case that's what was used.
Link Posted: 6/20/2012 3:01:12 PM EDT
[Last Edit: 6/20/2012 3:13:45 PM EDT by Silver_Surfer]
Originally Posted By Fat_McNasty:
take it/send it a smith so I does not get fucked up, for $500 Alex?


This
or get the correct tools. The amount of torque your talking about might twist your receiver since you dont have the viseblocks either.

**At lease put your bolt carrier back in***
Link Posted: 6/20/2012 3:04:26 PM EDT
It's a two peice tube, remove the longer portion and you'll have access to the barrel nut section. Just use an AR15 armorers tool to tighten or loosen to the next gas tube hole.
Link Posted: 6/20/2012 3:04:45 PM EDT
Originally Posted By Fat_McNasty:
take it/send it a smith so I does not get fucked up, for $500 Alex?


Lol, at least you're not biased. Please tell me what they would do that I can't? When I took my USP to one to get sights installed they were going to use a hammer and punch. I bought a sight tool.
Link Posted: 6/20/2012 3:07:54 PM EDT
Send it to LMT...

Posted Via AR15.Com Mobile
Link Posted: 6/20/2012 3:08:32 PM EDT
Originally Posted By TrojanMan:
Post your location and I'm almost certain there's an ARFCOMer in your area with a proper upper receiver block, armorer's tool, and torque wrench.

The way you're doing it is... very redneck.


If you absolutely must continue as you are, use the "snug three times" technique. Back the nut out about a quarter turn, then snug it up again, and repeat once more and everything should line up. Of course, the FF tube will then be at the incorrect angle of rotation, but at least you'll have a shootable rifle.

ETA: Red Loctite releases at 450*F, FYI, in case that's what was used.


I have an armorers block for an AR-15 but it does not fit the AR-10/Ma-Ten. It is very secure in the vise. Most people use the bolt on vise block thing (claw) on the lower part of the upper and a block of wood on the rail section, I don't see the difference. It's not twisting. I hit it with the heat gun but not that hot, I don't want to mess up the finish but that's still an option. I actually can't break it loose it's on so tight. Maybe the armalite barrel and DPMS tube are not able to be used together. I see daylight between the FF tube end and the upper so I think it can still be torqued a bit more. I have another like this (AR-15) that I had to back off to align the tube and it's my most accurate rifle, go figure. I want this one tight though being .308 and all.
Link Posted: 6/20/2012 3:17:32 PM EDT
[Last Edit: 6/20/2012 3:18:45 PM EDT by 57Strat]
I would loosen it and re-tighten a few times and it will be easier each time to make it to the slot you need for the gas tube. It is critical that you apply grease to the threads each time.
Link Posted: 6/20/2012 3:25:05 PM EDT
Originally Posted By QwikKotaTx:
Originally Posted By Fat_McNasty:
take it/send it a smith so I does not get fucked up, for $500 Alex?


Lol, at least you're not biased. Please tell me what they would do that I can't? When I took my USP to one to get sights installed they were going to use a hammer and punch. I bought a sight tool.


IDK maybe use the right tools? If you were in southern oregon Id hook ya up but after that little snip I've changed my mind.

get a action block and the nut wrench. Get the tube apart by holding the nut end with the wrench and gripping the tube with a strap wrench then heat with mapp gas torch. Once apart then tighten nut to torque. You do have a torque wrench in your plumbing supplies right?
Link Posted: 6/20/2012 3:33:01 PM EDT
Ok, everyone, correct me if I'm wrong, but no one makes an armorers block for the Ma-Ten upper. The clam shell style etc. If a strap wrench or pipe wrench on rubber is slipping, it is not a problem with the clamping method. I have a heat gun but don't want to use the torch.
Link Posted: 6/20/2012 3:48:03 PM EDT
The ArmaLite is rejecting the DPMS tube.




Link Posted: 6/20/2012 3:57:13 PM EDT
Heat is your friend.
Link Posted: 6/20/2012 4:01:20 PM EDT

Originally Posted By QwikKotaTx:
<snip> I have a heat gun but don't want to use the torch.

Maybe try the oven
Link Posted: 6/20/2012 4:11:53 PM EDT
Originally Posted By E-Mag:

Originally Posted By QwikKotaTx:
<snip> I have a heat gun but don't want to use the torch.

Maybe try the oven


That's how I got the barrel in the upper. That and a rubber mallet. This shit has been ridiculous.
Link Posted: 6/20/2012 4:15:44 PM EDT
[Last Edit: 6/20/2012 4:27:01 PM EDT by BadCoverBrian]
Cant tell from the pics, but it looks like the new nut is flush up against the upper receiver and that's why it wont turn any more. Seem like it ought to be offset a bit so the face of the nut doesn't contact the front of the receiver.

eta. if the face of the nut is contacting the front of the receiver, no amount of force is going to move it further - something will give and ultimately break. You'll strip the threads in the nut or on the receiver, or even break the front off the receiver. Then someone like me will pile on and tell you the front fell off.
Link Posted: 6/20/2012 4:17:27 PM EDT
I would try a Torca exhaust clamp.



Clamped down on an innertube or something to protect the tube and give it a strong grip. Then take a 3 or 4 lb hammer and a brass punch and give it love taps on the nut of the clamp.

Link Posted: 6/20/2012 4:29:03 PM EDT

Originally Posted By OlCrow:
The ArmaLite is rejecting the DPMS tube.





LarryG is feeling a disturbance in The Force
Link Posted: 6/20/2012 5:20:59 PM EDT
Originally Posted By BadCoverBrian:
Cant tell from the pics, but it looks like the new nut is flush up against the upper receiver and that's why it wont turn any more. Seem like it ought to be offset a bit so the face of the nut doesn't contact the front of the receiver.

eta. if the face of the nut is contacting the front of the receiver, no amount of force is going to move it further - something will give and ultimately break. You'll strip the threads in the nut or on the receiver, or even break the front off the receiver. Then someone like me will pile on and tell you the front fell off.


I thought so too, but there is a slight gap, light comes through when I shine my uber cool tactical light behind it. I only need to move it a smidge. The hole is almost lined up for the gas tube. I'm surprised how strong forged aluminum is but I definitely don't want to ruin anything.
Link Posted: 6/20/2012 5:24:08 PM EDT
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