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Posted: 2/24/2010 11:51:34 AM EDT
| I have an old 870 Express I've had since I was a kid and it's been acting up abit lately. It has a Wilson Combat 2rnd extension on it, tube has long been drilled out where the indentations are in an Express mag tube, and has the xtra power spring/follower. No internal mods other than big button safety and it probably has had 4-5000 rounds through it. It has never had a hickup until recently it has on occasion, failed to release a new shotshell from the tube when cycling. I have tried and cannot get it to repeat it, just at random when using it. It will eject the fired shell, slide racks fine and when I press the trigger it simply clicks on an empty chamber. All the times when I cycle it again after it picks up its next shell from the tube and works fine. Any ideas? |
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When was the last time you replace the spring? They are under $10 apiece and if you have fired that many rounds, the spring has seen many compression/decompression cycles and is probably a little tired.
Give that a try & see if the ole girl is back up in no time 
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| As Cos said, replace the mag tube spring and then the carrier dog follower spring. A few bucks in springs is a cheap fix and can rule out the basic issues. After these are in and the problem continues you know what it is not. Most all the feed and fuction issues are one of these two springs. |
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Quoted:
As Cos said, replace the mag tube spring and then the carrier dog follower spring. A few bucks in springs is a cheap fix and can rule out the basic issues. After these are in and the problem continues you know what it is not. Most all the feed and fuction issues are one of these two springs. I just ordered the springs, is the carrier dog follower spring hard to install? |
| No, the spring is simple to install. Go to www.aiptactical.com and put your cursor on the customer service link. In the drop down box you will see some "How to Videos". Watch the one "Carrier Dog Follower Spring" and it will show you how easy it is to change out. |
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Another possible fix is to clean the receiver under the shell stops. After years of use, the receiver under the stops may be impacted with old fouling and burned powder particles.
DO NOT REMOVE THE STOPS. They have to be tightly staked in place and re-staking requires a special tool. Get a can of a "gun scrubber" and use it to liberally blast out the inside of the receiver, directing the blast behind the shell stops. Allow to totally dry then spray in a good lubricant. Rem-Oil or CLP Breakfree are very good. Allow the excess to drain out. The stops should have good spring tension when they're pressed against the receiver walls. Also, use a large diameter brush (Brownell's sells some) to clean out the magazine and the magazine extension. Often old grim or even rust can be inside. Check the magazine follower for cracks or deformation |
| For a slight update I finally got it to repeat the problem with snap caps. I sat for an hour in my gun room continuously running snap caps through it and I noticed at one instant with the bolt back and the chambered round just ejecting, the carrier seemed to lose its tension and by bumping the gun just abit the carrier lifted up enough to prevent the next shell in the tube from making its way out. |
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New carrier dog follower spring part number 10.
http://www.brownells.com/.aspx/pid=0/sid=134/schematicsdetail/870_Standard_Weight__12__16__20 |
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