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Posted: 4/27/2008 7:25:46 PM EDT
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Inside the spring, is there supposed to be a tiny rubber bumper? I have never seen this on the A1's and 2's the I have cleaned while in the military. My main concern was, would it lead to double feeding? I took my newly assembled AR to the range today and out of about 200rds it jammed 15-20 times. Once it jammed in a way that it acted like it was trying to eject it from the top. It actually got wedged between the bolt cam face and the gas tube. I used 3, 30rd Cproducts mags(new) and one 10rd colt mag(used). They all would jam. So its not a mag issue. The ejector looks to be in good shape, no wear. I didnt pick any of the stuck brass back up, was to frustrated. But I did look at some of the brass that made it through successfully. On the lip I could see and feel where the ejector grabbed the round and spent it out. I was using federal ammo. It seemed to be soft brass to me. will not be using that again. The BCG was well oiled. Could it be the chamber? If yes, will a chamber brush and a good scrub help? oh, it is stroking correctly. when mag is empty, the bolt catches open. |
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Regarding the extractor spring, a small cylindrical insert inside the spring is normal, This keeps the spring from collapsing sideways. If you have a donut type disc around the spring, than that is an add on to increase the tension of the extractor. On the jam, was this a double feed jam with a live round and a spent case? If yes, install a #60 O-ring around the extractor spring to add tension to the extractor. In cases like this, the extractor can drop the case off the bolt face before the end of stroke, and the spent brass is never cleanly ejected from the action. The O- ring should band-aid the rifle until the chamber self polish out through life fire in a few hundred round. which will solve the problem if the extractor spring is in good working order (read not weak to begin with). Also, if the rifle is a carbine, pull all the way back on the CH and take a look at the bolt face against the back of the ejection port. The bolt face should stop about 1/4" to 3/8" in front of the back of the ejection port. If the bolt face is allowed to cycle back past the back of the ejection port, the the spent case is deflected off the back of the port and can be thrown back into the action. If you getting a live round nosing up, then it's all mag, and maybe the mags need to be pulled apart and cleaned if they are new/semi new. Also, confirm that the threads of the mag catch assembly is flush with the face of the mag release button. |
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Also to add, the ejector spring will not have a insert inside the spring since it is contained within the bolt (ejector channel) with no worries of it collapsing sideways. Furthermore, when installing the extractor spring, the large coil side goes into the extractor. This retains the spring in the unit so it will not fall out when the extractor is pulled from the bolt. |
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