AR Sponsor
Posted: 7/10/2005 2:01:47 PM EDT
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Sorry for the double post but I did not see the troubleshooting forum first so I thought that I should post this in the appropriate forum. I recently bought an AR-15 and went out to fire it today. However, when I was shooting it I ran into multiple fail to feed issues, fail to fire, and a round that became deformed after it was fired. I think that out of 45 rounds fired, there was a fail to feed or fail to fire between 8 and 10 times. The lower is a Rock River lower but the upper is not nearly as high of quality. The magazines are supposedly GI magazines with the green followers. The ammunition that was being shot was brand new Winchester 5.56. There were several rounds that you can see the dimpling on the primer but the round did not fire. And then on the final round, the round fired it looks like the primer of the round just melted. The part where the firing pin hits is completely gone and you can look through the round. One other thing, one of my friends was trying to figure out what wrong and he said that the bolt assembly seems to be really tight and that it almost sounds like it is grinding against the frame as you pull the charging handle. I tried one of my friends magazines and still had fail to feed and fail to fire problems. I doubt that that magazine was bad because he has fired around 90 rounds using that magazine and did not have a single fail to feed or fail to fire problem with his AR-15. I looked at the feed ramp and it seems smooth. The entire gun was cleaned and well oiled prior to my taking it to the range today. If nothing else seems to be the problem, I will try new ammunition the next time I am at the range How can I determine whether or not it is the bolt that is the problem, the upper, or a combination of both. I am sorry that I do not have any pictures of the rounds but I could not figure out how to post pictures to this site. |
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sounds like crap ammo to me. try something in 55grain and diffrent manf. who made your bolt and upper? and also if you fee; grinding when you pull the chargeing handle back try figureing out where its grinding one piece at a time, first try moveing the bolt back with out the spring and buffer tube by popping the take down pin and pivot it on the front pin and then pull the chargeing handle and see if it still grinds. if it does start takeing it apart tell you find out whats grinding |
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One other piece of information that might help someone figure out what the problem is with my new rifle: Last night, I looked at it again, and there seems to be excessive wear on the spent brass deflector. The finish has started to wear off, and this is after 45 rounds have been fired through it. I know that there is not anything that I have done when handling, storing, or cleaning the rifle that could have caused that much wear. I don't know if this is a result of the problem that I had at the range or just an indication of the quality of the upper. |
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The hole in the primer is due to over pressure. You need to check head space, bolt, and firing pin. I'm guessing the bolt, gas rings, and firing pin are probably worn. www.brownells.com/aspx/ns/Schematics/SchemMFg.aspx?schemid=811 Shok |
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