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combatshotgun

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Reply with quote  #1 
This is the Achilles Heel of the 870.  The tip of the ejector sticks out and there is a notch in the barrel stem that it fits into.  This keeps the rear of the barrel in place and the magazine cap or magazine tube couple if you have an extension keeps the barrel on the weapon.

If the tip of Ejector breaks off you have a bugger of a repair.   It takes special tools to replace the ejector and you will need an ejector, forward and rear rivets and may want to get a new ejector spring if on an older gun.

The rivets will never be flush with the receiver and since they are bare metal they will need some kind of finish.  Not an issue when you are also going to refinish the receiver as the rivets can be ground down but you can't do that without damaging the existing finish.

So, don't break your ejector.   Yes, you cause this.  How?  Keep reading

Breaking the tip of ejector is caused two ways.  One is you are not careful when installing the barrel and force it home.  This cause it to weaken from being bent slightly up or down.   So, when installing the barrel slide it into the receiver then carefully ensure it slips over the tip of the ejector and seats on the ledge there.  This ensures it remains strong and will not crack or break.  Unless you ignore the Second reason below.

Second and most common is that your magazine cap or magazine tube coupling is loose.  This causes a slight movement of the barrel, not enough to prevent lock up or be unsafe but enough to cause vibration on the tip of the ejector which is weakened over time and breaks.

So if you are aware of these causes and avoid them you can save yourself a lot of trouble.  Be careful when installing the barrel and always make sure your magazine cap or magazine tube coupling is tight.   


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D.J. north woods

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Reply with quote  #2 
What causes the spring to fold back? I hear more about that.
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combatshotgun

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Reply with quote  #3 
It is simply a spacer but is spring steel because it folds down out of the way of the breech bolt then springs back out and acts as a stop for the left edge of the spent shell.  The ejector continues to pull the right side of the spent shell backwards.  Since the left side of the spent shell is stopped this cause the front of spent shell to move to the right and out of the receiver.

The 20ga 870 does not has an ejector spring because the receiver is smaller so the left side of the spent shell hits the protrusion on the ejector creating the same result as above.  Since the 12ga receiver is wider it needs an ejector spring to spring back out and get in the way of the left side of spent shell.  This is why I say it is a spacer more then a spring.

I have never seen one fold back but have heard of that occurring.   It would be because the end of the spring broke off and the breech bolt cleared past the break and when the action is cycled forward it would of course fold the spring forward and break it off the front staking.  

This is also a part that is a bugger to replace.  50% of the time there will be enough material left on the original rivet to install a new spring.  The other 50% of the time you have to replace the front rivet and has a condition like in the original post but with only one rivet, the front one.

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splithoof

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Reply with quote  #4 
With regards to the second (and most common cause; a loose magazine tube cap): would maintaining a clamp (like the kind used for a front sling) help prevent this?.....my thought is that more support (like a clamp around the magazine extension and barrel) would make things more solid, and less prone to loosening, and therby protecting the ejector?....Your thoughts on that?
Thank you,
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combatshotgun

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Reply with quote  #5 
Nope.   The barrel ring detent of the Police or Wingmaster holds the magazine cap or magazine tube coupling in place.  Or, the internal retainer of the Express.   The magazine bracket on the Remington LE extensions simply holds the tube in place so it won't screw out and go down range on you.   Other extensions like the Wilson do not need an extension bracket as they are a one piece design.
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JD McGuire, Owner
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D.J. north woods

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Reply with quote  #6 
Thanks for the spring info J.D. You covered it very well, and again I learn
more about the 870. What a great web sight.
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GregB

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Reply with quote  #7 
Can you upgrade the ejector to a "tougher" or more durable part right out of the gate?


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combatshotgun

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Reply with quote  #8 
Nope that is the only one they make.  But you reminded me to do a post for older Wingmasters.
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D.J. north woods

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Reply with quote  #9 
Is the ejector a MIM product?
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combatshotgun

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Reply with quote  #10 
Yes, along with other parts in every 870 including Police and Wingmaster.  So these clowns that say the bought the Police because they didn't want any MIM parts in their gun are clueless.
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JD McGuire, Owner
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http://www.tacticalgunslings.com
Remington LE Armorer
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