January 18, 2011, 04:39 PM
I've broken down and reassembled my gun several times, but I've never yet got inside the magazine tube to clean it along with the follower and spring, and I can't find any instructions.
Does it just screw out in an anticlockwise direction? Is it a simple operation, or are the threads likely to be loctited?
I'd appreciate some advice.
January 18, 2011, 05:27 PM
You don't NEED to clean up in there, but I have cleaned mine, and not much dirt came out. Anyways yes it comes out counterclockwise, just like a screw. ( righty tighty, lefty loosy.) It's a simple operation, but it's REALLY screwed good and tight in there. I don't know if they come loctited from the factory, but mine was really tight. I used some pliers with soft plastic as the gripper parts, made for aluminum manifolds. Just be really careful not to bend the magazine tube. After all the trouble, and not enough dirtiness to care about, I probably won't be taking it back off again for another 5 years. Good luck.
January 18, 2011, 05:39 PM
January 19, 2011, 01:55 PM
A mild Loctite is used on those threads, so it is very tight.
Important: You will need to use a smooth jawed vice to start it out. Take the barrel off and clamp ONLY on the solid steel end of the magazine. If you clamp on the tube, it will collapse and you will be buying another tube.
Clamp it good and hard, if it slips it will scratch and that doesn't look good.
When you are done cleaning it, you may choose to reapply the Loctite.
Use the mild BLUE one, not the red one. If you use a strong Loctite, you can say goodbye to your receiver the next time you want to take it out, because the only way its coming out is with heat and it will melt the aluminum receiver.
When you screw the magazine back in, don't over do it or the receiver will pinch the thin mag lip closed and you wont be able to load shells.
Seriously, hand-tight is perfect for this. Let the Loctite do the rest.
I got all this off an AGI video with Robert Dunlap, I do not own a 500 myself..:)
But you know it makes sense.:D
January 21, 2011, 02:01 AM
Anybody that says you'll destroy the aluminum frame by heating the tube sufficiently to destroy the loctite is not qualified to make an answer.
If Dunlap said exactly that on a video, I say that their video is wrong.
If they say that it is advisable to minimize heat application, that's a different story- but a distinction with little difference.
Heating the tube in a prudent sensible fashion is no danger except with those frames covered with a decal or paint job that must not be burnt.
I have removed many parts loctited in place with no ill effects on aluminum from the heat.
I posted plenty of information that is more useful than that AGI video, evidently.
See the pictures of a tube that I removed by heating.
My first post there:
Mossberg tubes are loctited in place by the factory, so if anyone has one without, I would lay money on it being cleaned away by someone at some time without replacement upon assembly.
Dissimilar metals having differential expansion and variance in torque/loosening due to pounding, temperature, vibration, etc..... and... loctite is also for prevention of galvanic corrosion, too.
That being said, the Mossberg tube has an insert at the far end for the barrel retainer screw, and is a complete solid piece of metal inside the tube, minus a threaded through-hole. That is the end to grip with any strap wrench, if you use such a thing. Many other tubes do not have a solid plug on the end, and those would be better gripped nearest the frame, if heat is not to be used. An insert to fill the interior of the tube is HIGHLY recommended in those cases, also, to prevent strap wrench rollover crunch.
Breaking loctite free, if too resistant for the gripping of the far end of the tube, (and with rubber jaw liners for the vise as another tip) may require the use of a small propane torch flame on the otherwise stripped frame at the surround of the tube. The aluminum of the frame will wick the heat around fairly evenly, but keep the flame moving around the outer surfaces, anyway.
Usually there is some residue of old oil and dirt, and will cause an initial fuming with a distinct oily smell, but that will have to be gently burnt off before the temp. may destroy the loctite, but sometimes both happen at nearly the same time.
When the loctite starts to melt, a distinctly plastic-y burning smell and some puffing of fumes will erupt from the joint area, and can burn you quite easily if it pops onto you, so safety coverings and ventilation to minimize cyanide ingestion typical of plastic fumes, if you please. Make sure that the heating continues until the fuming/puffing tapers off, so you know that the loctite is fully toasted. If somebody had a plastic follower installed, about now you'll find it stuck to the inside of the tube, if you didn't make arrangements to hold it up in the tube with a metal rod (away from the heated end).
If you still had the tube end in the vise, you could probably now easily unscrew the tube from the frame, in most cases. The frame is large enough to get a grip for sufficient torque, but you may need heat-resisting gloves, if you are in a hurry.
The first picture is of a .410 with fireman's hose inspired rust and corrosion, along with a little heat damage.
Picture 2 shows the tube removed, with a little loctite still present, but no appreciable thread rusting.
Picture 3 shows the tube hole with remnants of the loctite, but no corrosion. The barrel receptacle is a mass of pure white corrosion product there and in the ejector channel. Dissimilar metal corrosion, with no typical rust-busting compound being effective. Aluminum corrosion is NOT RUST, so even Kroil is not the trick.
Picture 4 tells a valid tale about why loctite may be a big help. If the end of the tube (or the bottom of the hole) is not flat (see that the end is somewhat uneven), then the bottoming torque is not evenly distributed. Any similar situation can be seen to have a greater chance of working loose when the parts are repeatedly stressed, and especially when stressed in multiple manners: recoil, vibration, and so forth.
Mass production has a way of letting through a few parts that are less than perfect, but you will find that a cheap fix may keep them in use enough to satisfy the purchaser, in the beginning.
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