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Posted: 5/14/2014 1:48:51 PM EDT
| I just got my picked up my 870 and started to unload the tube and the spring was hungup inside. The first round was under pressure but the rest weren't. It was like the spring wasn't pushing on the rounds. I had to tilt the gun muzzle up and shake it to get the shells to come out of the tube. I'm using a vang comp +2 extension, the provided spring and ss follower, and winchester 00 buck. The spring does feel really weak when loading the gun by the way. Can you figure out what's causing this? What can I do to prevent it? The extension was tightened down all the way and I can't get it to mess again. I've only had the gun for about two years now and the extension itself for maybe 6 months. It never happened with the 4+1 magazine and its unnerving since this gun is my hd gun. Any help would be appreciated. I have not contacted vang comp. |
| My guess would be that the follower or spring was hanging up at the transition point between the extension and the end of the factory mag tube. I'd be looking for anything amiss in this area. Did your gun originally have dimples? Are there any burrs anywhere in this area on either piece? |
| I can't feel any burrs or anything that I think could have caused it. Also if I line 5 shells up under the tube, not in the gun but under the tube, it looks like it would put the follower around the area where the extension tube screws on. I have some 0000 steel wool I could take to the grinded part of the tube, do you all think that would help? |
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It's hard to say...
Make sure that the inner diameter of the tube in the area where there dimples were is completely uniform and smooth. If the extension tube doesn't line up perfectly with the end of the mag tube there can be a small lip formed by the mag tube. It doesn't take much of a lip to cause something to hang up. It's been known to happen before. Sometimes, taking a small, fine round jeweler's file and just slightly breaking the edge of the inner circumference of the mag tube can help. If the follower has any sharp edges where it rides on the inside of the tube, doing the same to it with a small fine flat file around its outer circumference is a good idea as well. Don't go crazy with metal removal. Just put a slight bevel on the edge to break the "sharpness" that can cause things to hang up. |
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Quoted:
It's hard to say... Make sure that the inner diameter of the tube in the area where there dimples were is completely uniform and smooth. If the extension tube doesn't line up perfectly with the end of the mag tube there can be a small lip formed by the mag tube. It doesn't take much of a lip to cause something to hang up. It's been known to happen before. Sometimes, taking a small, fine round jeweler's file and just slightly breaking the edge of the inner circumference of the mag tube can help. If the follower has any sharp edges where it rides on the inside of the tube, doing the same to it with a small fine flat file around its outer circumference is a good idea as well. Don't go crazy with metal removal. Just put a slight bevel on the edge to break the "sharpness" that can cause things to hang up. I would use 400 grit sand paper instead of a file and follow it with 600 grit. |
| I used some sandpaper and rounded off the edges of the follower and the tube. How can I say this wont happen again? I mean theres probably been around 400 rounds through this gun with the extension and never a hiccup until bam, major malfunction and my primary long gun is out of the fight. I'm kind of weirded out by this. |
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I had a similar issue that occurred when loading particular length shotshells in my vang comp setup. The follower would catch while feeding and not allow the last shell in. I fixed it by beveling the rear of the follower and corners of the extension transition area. This fixed the problem and I have not had any other issues after a few thousand rounds. If the spring feels weak while loading then replace it. I will replace my springs often. Also if you are using a barrel clamp to hold the extension in place this may also bind it up, a half turn to much is all it takes. I avoid barrel clamps in general.
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