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Posted: 9/6/2011 5:13:00 AM EDT
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I have asportswereus/r M-4 TRR-15specifically. It is still new and being broken in so to speak. I fired some Tula 5.56 through it, I had a FTEx that was a partial extract causing a double feed. Removed, cleaned. Started over. Had a seriously stuck case that I soaked in CLP then drove out with a cleaning rod. Cleaned really well. Couple of days later, same thing.
The cases are steel, not lacquered the extractor has a good hold of the case it is stuck hard. Used brass before them, but only 40 or so with no problems. These took 80 or so rounds to get here. Any thoughts? The Colt has no issues with these. This did not happen with the Tula. Could this be a chamber size issue? |
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Did you clean the chamber with a good solvent and a chamber brush? Are you using the proper amount of lubrication for a new rifle? Also you might want to run another 200-300 rounds of good brass ammo to break it in and polish the chamber a little before using the Tula stuff again. |
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When this malfunction occurred, you had a fail to extract, fail eject the empty casing, or a double feed of 2 live rounds? If it is a fail to eject the empty casing, then it is most likely that your bolt carrier assembly did not have enough energy pushing it to the rear to eject the empty casing of which could be caused by not enough gas pressure (my suggestion is to try a domestic manufactured brass cased ammunition and see what happens).
CY6 Greg Sullivan "Sully" SLR15 Rifles TheDefensiveEdge.com (763) 712-0123 |
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OK, lets see. It partially extracted the first time and didn't eject, worked fine until it recurred. Cleaned it and took it out again. It would not extract, I had to hammer it out with a rod. Twice. Yes, I was an infantryman for 14 years, it was clean. It is a 5.56.
I am thinking either something in the chamber or the steel is not springing back enough to clear the chamber. There are no signs of over pressure on the cases that were stuck. Jack |
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Quoted: OK, lets see. It partially extracted the first time and didn't eject, worked fine until it recurred. Cleaned it and took it out again. It would not extract, I had to hammer it out with a rod. Twice. Yes, I was an infantryman for 14 years, it was clean. It is a 5.56. I am thinking either something in the chamber or the steel is not springing back enough to clear the chamber. There are no signs of over pressure on the cases that were stuck. Jack Could be the chamber is just a little rough and/or tight and many times 200-300 rounds of good brass will cure the problem by polishing the walls of the chamber. You can also use flintz and a chamber mop to do the same thing by hand. |
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Quoted:
I have asportswereus/r M-4 TRR-15specifically. It is still new and being broken in so to speak. I fired some Tula 5.56 through it, I had a FTEx that was a partial extract causing a double feed. Removed, cleaned. Started over. Had a seriously stuck case that I soaked in CLP then drove out with a cleaning rod. Cleaned really well. Couple of days later, same thing. The cases are steel, not lacquered the extractor has a good hold of the case it is stuck hard. Used brass before them, but only 40 or so with no problems. These took 80 or so rounds to get here. Any thoughts?The Colt has no issues with these. This did not happen with the Tula. Could this be a chamber size issue? Don't shoot Tula in your M-4ish carbine? Find a standard cartridge that will work in both. |
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I've had a similar problem with a carbine gas system and tula. I need to get back to the range with different ammo to see if anything changes. Also trying tula in a 20" upper. It's possible the pressure curve of a carbine may not let the cartridge relax before the carrier starts moving. Some people try a heavier buffer to modify the pressure versus time curve. If you have a heavier buffer, try that also. The heavier buffer slows the timing between the gas entering the carrier and the bolt/carrier moving.
I have polished the chamber using a mop and flitz but have yet to test it out. |
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Could be a timing issue in that the rifle is unlocking too early, or possibly a chamber type/headspace issue. Are you running a collapsible stock, if so which buffer? How many rounds does the rifle have through it? Have you checked the rifle for headspace to see what size it is, and does it fit with in minimum spec? Have you tried an domestic newly manufactured brass cased ammunition, and have you tried any .223 ammunition?
CY6 Greg Sullivan "Sully" SLR15 Rifles TheDefensiveEdge.com (763) 712-0123 |
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Quoted:
Could this be a chamber size issue? Yes, in a way. The steel case ammo is coated to protect it from rusting, and as the ammo is loaded and extracted, small amounts of that coating will be scrapped off to cause a powderized fouling of such. In time, this will end up in the chamber, and causes the cases to have more of an adhesion effect to the chamber than normal. In a looser cross wall dimension or more polished chamber, such build up has less of an effect, and will cause less fouling (powderized) problems. Will the rifle always have this problem with steel coated ammo, may or may not. So on that note, get about 500 rounds down the barrel of brass cases to allow the rifle to self polish the chamber between live firings and cleaning, then try the ammo again. Also to point out, since the ammo is going to cause powderized fouling, you will find better luck with running the upper bearing areas more lubed with CLP. Although the CLP will not dissolve such, it will help to flush it out of the system. Lastly at stated above that CLP, or any other gun cleaning product short of acetone is not going to dissolve such fouling, when you go to clean the chamber, it has to be scrubbed with a chamber brush by hand to remove such fouling. Note: don't use Acetone to clean the rifle, you will burn holes in the plastic parts with it. |
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