Remington 870 Receiver Marks

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Buckshot87

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I bought an 870 express new a few months ago and have absolutely loved it, big step up from my Winchester 2200 in my opinion. So far i've put about 600 or so rounds through it and break in is going nicely, with one exception. I recently stripped the gun down for a thorough cleaning and found some wear on the inside of the receiver that bothers me. It appears the the locking lug has been peening the top of the receiver in 2 locations, I can't figure out why the lug would be going up in these locations and how it could cause this kind of mark in a steel receiver. There is no visible damage or wear to the lug (I have taken the bolt and carrier out, i just put them back in before taking photos).

This one is quite deep:

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This one is far less so (rear of the ejection port and a lot closer to what i would expect in normal break in wear but still seems a little excessive), I'm fairly sure the angled mark has always been in the receiver in this photo, i suspected it was from the proofing process and is not as deep as it looks in the photo, it does not have a raised ridge at the back like the other 2 marks.

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I can feel the slide get hung up a little on both of these marks, otherwise it slides quite easily and smoothly.

Additionally I notices while taking those photo's the the top of the extractor claw has gouged the side of the receiver a bit at the back of the ejection port.

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Again no wear to the extractor claw. I'm a bit disconcerted that the receiver seems this soft, but would like a couple other opinions before i ship the gun back to Remington.
 
I think that mark comes from the locking block notch when the action is cycled. The notch that locks into the barrel hood could be a bit sharp and peening the top of your receiver. Some wear in that area is fine, but yours is really deep. You must have a sharp edge at the top of the locking block notch.

A way to alleviate this is to file down the top corner of the locking block notch a few thou. and smoothen the peened area flush with the roof of the receiver.

When you cut a few thou. off the top of this notch, unlocking from the barrel hood becomes a bit smoother also.
 
Thanks everyone for the input. Should have clarified, I can feel the action catch in 2 places aside from the ejector spring being compressed, its minor but noticeable, and the location of slide travel matches when the locking lug crosses these 2 spots, one of which is before the bolt crosses the ejector spring, and one is after (this is with the trigger group out).

The gun has not been cycled aggressively, aside from one shell the would not eject. I guess it could be operator error but I've had other pump guns with far less rugged construction that never showed any ill effects of my use and this particular gun has only had a few hundred rounds through it. I've had my model 2200 for 10 years and retired it for this as I wanted something with a 3" chamber, interchangable chokes and better fit and balance. So far this gun has only seen patterning and shooting clays.

I've been in touch with Remington and have sent them photo's and am waiting to hear back. I've taken a look at my barrel hood and it shows some peening and wear in the finish as well, I'm starting to wonder if my locking lug is machine incorrectly, possibly too tall? I've taken a closer look at the locking lug, I wouldn't call it sharp, although i wouldn't call it rounded either, its more of a 45 degree angle.
 
I'm seeing the exact same thing. I striped mine down after seeing your thread. I bought this shotgun new 2 days ago and have fired about 200 rounds since. I only have the one mark and it's right where they tapped the rear rail mount hole. Please keep me posted on this. I'm very interested to hear what Remington has to say about it. I'm thinking that it's worn as much as it's going to get.

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Buckshot87, I just realized the heavy half moon peening in your first photo is in a different location than the area that would be marked from the locking block lug. The front mark is nominal wear and tear.

That heavily peened mark is at the rear of the receiver and couldn't possibly have been made by the locking block, or anything else for that matter. I think it's something that came that way from the factory. Maybe a vise mark of some sort. The steel can't possibly be that soft. There must have been a lot of force exerted to make that mark.

The only way that rear area has any contact with the locking lug is when the bolt is all the way at the rear of the receiver and the action is cycled forward aggressively. Even then, the lug could not gouge the roof of the receiver that way. It only slides across the roof of the receiver when the slide assembly moves forward under the bolt and pushes the locking lug upward while the bolt moves forward to engage the block into the notch under the barrel hood.

Anyway, I would just smoothen it out flush with the receiver so it doesn't bind and be done with it. If you want, fill the gouged hole with some JB Weld, but when the burr in the peening is removed, it shouldn't matter, or bind any longer.
 
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