Bad day at the Skeet range....

I had a 28 gauge Wingmaster made in 2005 that also had a burr in the chamber. Had it removed by a machinist with the right size hone to clean up the chamber and smooth the forcing cones.
 
You should take them to a gunsmith if that's what makes you comfortable ...but its also a chance to learn a little more about your shotgun.
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The 870 is still under warranty... So it should be fixed for free... Otherwise I would try to fix it myself...

There have been several threads on rough chambers in Remington 870s. IINM, there were related to the Express models, not the Wingmasters. In many postings there has been a failure to differentiate between the two models which may lead to confusion.
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This one is a Wingmaster not an Express..
 
The problem is pretty common on the 870 Express, for which it is easily cured with steel wool, sandpaper or a hone. Sometimes it goes away with shooting the dang thing. That problem is ascribed by most to be due to a failure to finish the chambers on the less expensive Express. The problem is so common that one Remington police armorer recommends polishing a new chamber with steel wool on a dowel, even before trying to fire it.

Your issue may be cured the same way, but perhaps not. Given the problems you had with the Wingmaster that was replaced, Remington should snap to and give you some service. Arguably, if you polish the chamber you may void your warranty. So I vote you have Remington fix it.

The same thing happened to a guy at Prado Shooting Park a couple of weeks ago with a Wingmaster and he had just recieved his to replace the one that he had purchased.
 
The problem with warranty service ...is it takes time ..and aggravation to ship it to an authorized service center.

A buddy just shipped a new Browning pump back to Browning in Missouri - because the stock bolt would not come out ...and they said it would be at least a month before they would get it back to him ( for just a bolt !!! ) ...and the sad thing is, I think that's typical these days from most if not all mfg's on warranty service.
 
870 Number Six here is a WM from 1955. With both its original barrel and Light Contour one it wears mostly, there's occasional glitches in the shuck when I feed it Gun Clubs. It eats the notorious Winchester valu pack stuff and all else save the GCs.

In the OP's case, try different ammo and see what happens...
 
What Dave suggests may well do the trick. Supposedly, running some shells through a 870 will loosen up the chamber. Also, using a hone to debur it is one thing, but cleaning with fine steel wool on a dowel is just that; cleaning. Cleaning shouldn't affect warranty.
 
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Took the 870 Wingmaster to the Remington Warranty Service center roughly 30 miles away... They checked the gun out and it has a substantially undersized chamber... They best part is as this is a new gun... It's on Remington and it will cost me nothing... To correct the problem, they are going to bore the chamber to spec. and then polish it... They told me that they correct this problem quite often on new 870s specifically, the express models.. They said for an 870 Wingmaster to have this problem is quite rare...

In the OP's case, try different ammo and see what happens...
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I tried Winchester AA (several different loads), Remington Gun Club, Federal Topgun Target, Federal Game Loads and RIO target loads... It did not like any of them..
 
They checked the gun out and it has a substantially undersized chamber…
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Someone has to get the barrel done with a chamber reamer's last cut. Has Remington lowered their standards, or was the QC guy taking a nap?
 
You guys are making me nervous. I have a brand new 12g Wingmaster on my 10 day wait period.

I had an Express version with an undersized chamber. Bolsa Gunsmithing fixed it under warranty and it works fine now.

I love 870s.

P.S. I specifically bought it last week so I would have time to take it to Bolsa Gunsmithing before dove season if it had problems.
 
You guys are making me nervous. I have a brand new 12g Wingmaster on my 10 day wait period.

I had an Express version with an undersized chamber. Bolsa Gunsmithing fixed it under warranty and it works fine now.

I love 870s.
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Mine is at Bolsa getting fixed... Good people...
 
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