AR Sponsor
Posted: 2/17/2003 5:30:26 PM EDT
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Ok, rifle is reliable for the first 40 or so shots, then about 3 out 5 shots either FTE and end up with a round in the chamber, and another round trying to load behind it, or the round does eject, but the bolt carrier comes to rest on top of the case, with the nose of the new round halfway in the chamber. Bushy 20" flatop, Orlite mags, Winchester .223 or SA battle pack, same result. Any suggestions before I take it to my smith? |
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Could be the orlite mags... I'm assuming you're firing thirty rounds and changing mags. Maybe one of your orlites is need of modification or replacement with USGI mags. Every problem I've had with AR-15/M-16 has been with a magazine or being issued a weapon that someone has used and abused. I'd get my hands on some NEW USGI mags. You should be able to find them for approx $20-25 apiece. May not be the problem, but is a place to start and extra mags never hurt... |
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Seems like a mag problem would manifest itself immediately, instead of waiting for the rifle to warm up. It almost seems like something is heating up and expanding, causing it to bind. I think I am just going to take it in tomorrow and let the professional look at it. |
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Netsloth, Lets take a good look at what you have stated. Your first statement of the round remaining in the chamber is caused by the extractor being torn from the case rim. The second problem is the extractor holding onto rim, but due to the amount of force required to pull the spent case out of the chamber, the carrier/bolt is not making it past the end of the ammo in your mag(cocking stroke), and stripping the round by the top of the case (not behind the rim); forcing the front of the round into the chamber with the bolt coming to rest on top of the round. The condition that you failed to mention was that the ejection path of the ejected rounds was to the 2:00 position of the ejection port, and only a few feet of distance. Note: the correct ejection path should be to 4:00 and a good 10//15 feet if the stock rifle is running correctly. What the rifle is telling you is that you have an over pressure ammo for the current chamber conditions. Considering that you are shooting rounds that are standard pressure for the rifle, it boils down to the chamber conditions. Your first line of attack is to clean the rifle and spend some more time on the chamber and barrel. When you clean the barrel start off by using the chamber brush and a good cleaning solvent. Once you have cleaned the chamber as best as you think you can, drop a 30cal mop on a single section of rod, and use a drill to spin the mop (soaked in solvent) in the chamber. You will be surprised on the amount of fouling/crap that is still left in the chamber. Once you have the rifle/barrel re-cleaned, remember to apply a light coat of CLP to the all the bearing surfaces, and retry the rifle. If the rifle still jams, fully cleaned after 40 rounds, then we can look into polishing the chamber. But for right now, lets just retry the rifle cleaned and lubed. Also, bad mags will cause a FTF problem, and have nothing to do with the rifles ability of extracting a round from the chamber. P.S. Just for the record, the two solvents that you should be using in the rifle are CLP to clean and lube the rifle, and a good copper solvent to clean the barrel and bore. Once the bore is cleaned with the copper solvent, remember to clean out the copper solvent in the barrel/chamber with a patch soaked in CLP, then a dry patch to remove the CLP/remaning sovent in the bore. Copper solvent will become tacky if any traces are left in the chamber, and if allowed to become hot/fouled in the chamber, will cause the same problems that you are having in your rifle. The reason that I know this, is that I did the same thing to a HK rifle not to long to ago (never clean a rifle when being rushed to take your wife out to dinner) and the sticky copper solvent bound the spent cases to the fluted chamber. Thankfully, I never go shooting with out the economy size can of CLP and just cleaned the solvent out of the chamber bore in the field to correct the problem. Dano |
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Here's something to look for.Take out your bolt carrier and look thru the ejection port to the area inside your rifle where the carrier rides.Look for a 'groove' or mark that looks like something is rubbing wrong.Mine was a thin line caused by a bur on the carrier.I needed it deburred and needed a new bolt.(Actually had the upper |
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