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Posted: 3/9/2004 2:26:50 PM EDT
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My '03 SAR-1 has a feeding problem. When I chamber a round, the nose of the bullet hits the backside of the barrel and then feeds successfully. This is a non-issue except that the bullet becomes deformed and it affects accuracy. Question, what can I do to remedy this? Can I re-contour this area of the barrel as to make a less flat edge (feed ramp of sorts) or will this affect chamber support? Please help me with this, I really want to get it sorted out. Thanks. |
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using the clock, where is the bullet striking the chamber face? 6 o'clock? 12 o'clock? i would guess a ramp job might be in order for you. from the sounds of things, the feed ramp geometry is only off by a small amount. radiusing your feed ramp's leading edge may solve this problem in 5 minutes. |
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Thanks for the reply Bob and I get what you are saying. First, let me make sure I am on the same page as you. When you say "feed ramp", are you refering to the area on the receiver where the bullet makes contact? Or, the area on the barrel where the bullet makes contact? I have been calling the receiver area the feed ramp and that is what I radiused and polished to fix my first problem. I am now wondering whether or not I can hurt the gun by doing the same thing to the barrel. I don't know much about proper case head and chamber support and the like, but do know that this area is where these things happen. The bullet hits the barrel at between 5 o'clock and 7 o'clock depending on what side of the magazine it comes out of but more to the 5 or 6 o'clock side. I have also noticed that the very back of this barrel is shaped oddly. Instead of being flush all the way around, it has a lip that sits higher (or further back, depending on how you look at it) than the rest of the end. This raised lip runs from about 3 o'clock to 12 o'clock and is the same thickness as the barrel where it is not raised. I sure hope you can help me because this is starting to drive me batty! Thanks. |
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When you say "feed ramp", are you refering to the area on the receiver where the bullet makes contact? Or, the area on the barrel where the bullet makes contact? the feed ramp is the semi-circular piece of steel that is riveted onto the trunnion. often called a "bullet guide", it is located in front of and belew the face of the bbl. its' job is to guide the nose of the bullet towards the mouth of the chamber. I have been calling the receiver area the feed ramp and that is what I radiused and polished to fix my first problem. a good first step. i would also suggest you deburr the underside of the magazine feed lips and look at your extractor for proper tavel and burrs. I am now wondering whether or not I can hurt the gun by doing the same thing to the barrel. I don't know much about proper case head and chamber support and the like, but do know that this area is where these things happen. a LITTLE chamfer will not be dangerous. you should ask smoe local smiths what they think =you can get away with. i rarely do more than polish the feed chamfer. The bullet hits the barrel at between 5 o'clock and 7 o'clock depending on what side of the magazine it comes out of but more to the 5 or 6 o'clock side. a 'low' strike. sound like the bullet is being turned, but perhaps not quite enough. I have also noticed that the very back of this barrel is shaped oddly. Instead of being flush all the way around, it has a lip that sits higher (or further back, depending on how you look at it) than the rest of the end. This raised lip runs from about 3 o'clock to 12 o'clock and is the same thickness as the barrel where it is not raised. this is the relief cut for the extractor. |
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Here is a picture of the part I am missing (I think). http://www.k-var.com/images/AK-545BG.jpg |
| While the gun/round are very tolerant, some just need the guide. Tack welds have been used, usually after a JBWeld test for position function. Pipes have been cut and dremeled to suit for those who can't bring themselves to pay $25 shipped for one bit from a vendor. |
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Come on, tons of people are looking at this topic, but only a handful of responses? I thought you guys were the authorities on AK's. Here is a link to the pics of my non-existant bullet guide. http://home.sc.rr.com/verbatimspics/1.jpg http://home.sc.rr.com/verbatimspics/2.jpg |
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the bulletguide has nothing to do with the bolt or its' locking. the sar-1 does not utilized the same bulletguide as the one you pictured. it is permissible to relieve/radius the mouth of the chamber...BUT...not being able to gauge what material is missing, it is impossible to hazard a gues as to how much more can be removed. your pictures seem to indicate that you have material available for polishing away a larger radius. |
| You have a bullet guide they all do you just cant see it very well because the rivet isnt going to show as they ground down smooth. look at the sides and it looks as if the trunion is one piece but it isnt. My Sar 1 has a little bevel about 1/8 " wide at the six o'clock position on the barrel face.Not sure but I think all the 2000 models have it. |
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