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Posted: 2/9/2013 3:55:55 PM EDT
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Hi guys. A friend of mine has a Mak 90 with a stuck case and the broken shell extractor isn't doing anything. It just pops past the case mouth.
I'm stuck here. My next thought is to thread a tap down in the case and tap it out with a cleaning rod from the front end. Thoughts? |
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Heat up the outside of the chamber area with a blow dryer (or similar) to expand the diameter of the chamber slightly then chill the case quickly, A can of canned air turned upside down and sprayed in the chamber will freeze it quickly then use your prechilled case remover.
You might want to put some kroil or similar in the case before you start this to help |
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I've tried hot/cold. No joy. I just went and bought a tap set and threaded one all the way up in that bitch(took 45 minutes cause it is a bitch to get to turn in that tight space) and tapped on that till the damn tap came out. Shell is still stuck. It's like they superglued it in there.
Time for a chamber reamer? |
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Brownells, Midway, and Sinclair International will have cerrosafe. I'm betting McMaster Carr and a couple of the machine too suppliers have it, too. I know they have similar bismuth alloys, which can be used for the same application.
http://www.mcmaster.com/#low-melting-temperature-alloys/=lfb0cs |
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Quoted:
Cerrosafe swells at a constant rate, one hour after it is poured. It shrinks, initially, but 3 or 4 hours after its poured it will be .003-.005" bigger than whatever it was poured into. Well, I have mangled my brass rod beyond recognition, removed it and now I have an old Yugo Mauser cleaning rod in there. I have beaten on it for 15 minutes with no joy. Not a mm of movement. I have the cleaning rod taped so it doesn't damage the bore but it just ain't going. |
Okay, okay, okay! I would clamp that recalcitrant chicom gun into a padded vice by the barrel so it can't move and try one more time. But this time I would try a little different approach. You'll need the two of you to do this. One take a light hammer and tap as fast as you can on the barrel just above the chamber. The other person give that rod a hard hit with that 3 pounder while the other one is tapping. This might break the friction enough to make the case let go. The taps on the barrel don't need to be monstrously hard, just firm and fast. It's easy enough to try and won't hurt the gun. |
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Quoted:
Okay, okay, okay! I would clamp that recalcitrant chicom gun into a padded vice by the barrel so it can't move and try one more time. But this time I would try a little different approach. You'll need the two of you to do this. One take a light hammer and tap as fast as you can on the barrel just above the chamber. The other person give that rod a hard hit with that 3 pounder while the other one is tapping. This might break the friction enough to make the case let go. The taps on the barrel don't need to be monstrously hard, just firm and fast. It's easy enough to try and won't hurt the gun. Now you're just fucking with me.... You gonna send me for a box of grid squares next? |
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Cut it off so it barely sticks out of the barrel. That will improve its buckling strength. Maybe add a pad of wood on the crown.
Tap just outside the chamber where the case is stuck. The tapping method I described is common for loosening tight screws and it might work here. You can prove to yourself how powerful this is. Put a heavy book on a smooth table top. Push it with a finger, note how much force is needed. Then, do that again, but touch an adjacent side just hard enough to apply a force without moving the book, and push it again. You'll easily detect that the book was easier to move. This is the same principle that works on a tight thread. Next time you have a tight screw, get someone to tap on the end of the screwdriver while you turn it. Make sure the screwdriver fits the screw head correctly. You'll be amazed. |
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Have you tried sacrificing some type of animal to the gun gods?
Or is there any edge of the case sticking out of the chamber enough toget a small pin punch on the enge and try to collapse in one side of the case body? Or if the case head is completely broken off below the edge of the chamber, could you sharpen a brass punch to a point and tap it between the case and the chamber wall and then collapse the case? wouldn't take much, as soon as you moved the bras it should unstick all the way around. I did this once with a 308 AR that I had to pull the barrel out of the upper. With a little edge of a pick, I opened up the edge and shoves a sharpened brass jag between the case and the chamber. it collapsed the brass case wall and the whole casing dropped right out. Looking closely the only thing I could see was a tiny nick in the edge of the chamber back by the breach face that I polished out with some emory cloth on a dowel. As said above, if the casting is out and you still can, I would also plug the bore, stand it on the muzzle and fill with kroil or another penetrating oil and let it soak for a day or two, then try again. |
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Quoted:
Have you tried sacrificing some type of animal to the gun gods? Or is there any edge of the case sticking out of the chamber enough toget a small pin punch on the enge and try to collapse in one side of the case body? Or if the case head is completely broken off below the edge of the chamber, could you sharpen a brass punch to a point and tap it between the case and the chamber wall and then collapse the case? wouldn't take much, as soon as you moved the bras it should unstick all the way around. I did this once with a 308 AR that I had to pull the barrel out of the upper. With a little edge of a pick, I opened up the edge and shoves a sharpened brass jag between the case and the chamber. it collapsed the brass case wall and the whole casing dropped right out. Looking closely the only thing I could see was a tiny nick in the edge of the chamber back by the breach face that I polished out with some emory cloth on a dowel. As said above, if the casting is out and you still can, I would also plug the bore, stand it on the muzzle and fill with kroil or another penetrating oil and let it soak for a day or two, then try again. I tried exactly everything you suggested |
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Victory is mine! I took a 5/16 drill rod and turned it down in a drill until it was about .305, polished it smooth and tested it. No rubbing. I then tossed in a little bit of PB blaster and cut a leather washer.
I put the washer in and pressed it down on top of the PB and hit it.....twice. Popped right the fuck out! Thanks for all the help fellas. |
I learned an expensive lesson when I had a stuck case in a ruger 10/22 I clped the fuck out of it and let it sit over night. Figured ill use a cheap cleaning rod to pound it out fucker mushroomed slightly and was stuck in ther good  ended up throwing the barrel away and selling the action
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