Help me troubleshoot: Remington 870 Marine Mag not cycling

anark

anark

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Hey guys,

I have a Remington 870 Marine Mag that was purchased new.

The problem: Will not cycle/eject spent hull only after firing, but will cycle/eject when just loading and cycling (not firing).

I've field stripped and it all seems to check out fine. I own a few 870s so it's not a botched field strip job.

Can anybody think of what I should be looking at or what the problem may be to cause this? It's an odd issue and not being able to strip and shoot (I'm not close to a range) makes troubleshooting a very long process.

Thanks guys!
 
Are they cheap shells that are sticking in the chamber while fired? Does this happen with different brands of ammo?
 
Change shells, if it is still acting up, the chamber may need polishing or you may need a new extractor
 
Try different ammo. If switching ammo fails, polish your chamber. It's easy and you don't need much for tools/supplies.
 
My 870 was terrible when I first bought it, cycling the cheap-o low base aluminum shells. I switched to a better brand for a few cases, and now, a few years later it' cycle anything and everything. So Id say either polish it a bit, or just put a few hundred better quality shells through it first.
 
Ah Remingtons new QC and their sticky chambers

This is NOT a ammo problem or your extractor, it is your chamber and a easy fix too :)

You need to polish your chamber, you need the following;

-12 gauge bore brush
-12 gauge cleaning rod "one section"
-steel wool
-cordless drill
-oil

Remove barrel and put the 12 gauge brush and rod into the cordlees drill. Then rap the brush with steel wool and soak the steel wool in oil. Now stick it in your chamber and work it like a ####star ;)
 
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Give 'er a good reaming eh? (I'm a mechanic so I'm used honing cylinders)

I'll give it a shot. Thanks guys. CGN is the bestest.
 
Honing cylinder will speed things up, just dont go to crazy with it.

Lets us know how she shoots after
 
anark said:
Give 'er a good reaming eh? (I'm a mechanic so I'm used honing cylinders)

I'll give it a shot. Thanks guys. CGN is the bestest.
Click to expand...

yep, just like honing a cylinder. I use a 1" hardwood dowel wrapped in steel wool. Put a screw in the end and cut the head off to give you something to chuck in the drill. I've never tried this, but I bet one of those die grinder flap wheel sanding drums in a very fine grit would work. The key with whatever method is to not change the chamber dimensions - just polish till it's smooth as glass. Steel wool works so well because you can't really over do it. If you use a ceramic hone or abrasives then you gotta use a real light touch
 
flapwheels will remove way to much material. I'd even go at it by hand and not a powertool, personally.

Since you're a mechanic you should know all about lapping compounds. Use them when you're nearing completion to clean it up and make it smooth.
 
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