[rightside]

Need a little help. I have a Remington 870 Marine Magnum with around 200 to 500 rounds through it, 3 years old. The problem is: after shooting 10 to 15 rounds the pump starts sticking, not always but sometimes. Almost like the barrel gets so hot that it wont cycle. Seems different each time, sticks a little or sticks allot! For the most part I am a pistol or AR guy and do not know much about shot guns. I am thinking about selling or trading it, but, cannot (with a clear conscious) until I get this fixed or figured out.
Any help would be appreciated.
Thanks

[EvanWilliams]

Disassemble. Clean thoroughly. Lube.
Try rapid fire one box of cheap game loads or something. See if it happens after a thorough cleaning.

[rightside]

Thanks Evan, I tried that and worked for awhile.... lots of grease...maybe I dont know how to take proper care of it.
Thanks

[AcceptableUserName]

well, learn how then. Do you know how to properly fieldstrip the gun and reaseemble? That's the first priority. go on youtube and search "remington 870 disassembly". Watch and learn and then rewatch. Do it while watching to learn the simple process. Memorize it. Clean and LIGHTLY oil your gun after every use and once every 6 months even if it hasn't been used.


it's a SLIGHT possibility your chamber needs polishing. I don't think it eneds to be polished you tooo much. You could probably polish it with standard cleaning patches and oil. It'll take some work and some time but if you use about 3-4 12 gauge patches (to where you can just barely squeeze the patchholder/rod into the chamber from the breach end) and stick them into the chamber and spin them around for 10-15 minutes...then reclean the bore with a few strokes I think your problem will go away. there;s heavier duty methods for polishing like jewelers cloth, etc etc, I find most jobs can be accomplished with some oil, cleaning patches,a rod and some elbow grease and time.


Your Marine Magnum is on the pricier end of short-barrelled defense shotguns, so take care of it. If you hate it and feel like it's a bad apple, I'll gladly relieve you of the stress of owning it. I'll pay the shipping. :)

[CWL]

That's strange since the MM (and most 870s) tends to be bullet-proof.

Is it the forestock that is sticking when you are trying to eject/chamber the next shell, or is the actual shell sticking in the chamber when you are trying to eject?

[rightside]

Have not shot it in a few years, so I cannot remember if it was the shell sticking or the front end. I am planning on shooting it this weekend sometime. I did find a video (as suggested) and for the first time stripped it down and cleaned it.:eek: Boy it did need a good cleaning and I did spend a little time polishing the chamber:D. Hopefully that was the cause of the problem. If it was I'll feel like such a dumb azz. :banghead: For the record all my other guns get thoroughly cleaned after each use and now that I know how so will this one.
Thanks for all your help I will post next week with the results.

[dfariswheel]

Careful on standard chamber polishing on the Magnum Marine.

As I recall, the bore and chamber are plated.
Polishing the chamber with steel wool or another abrasive like you can do on standard barrels will seriously damage the interior barrel coating.

For most shotguns, the best option is to not allow the chamber to get dirty or rusty to start with.
Buy and regularly use a shotgun chamber brush made to clean chambers without damaging them:

http://www.brownells.com/.aspx/pid=1248/Product/_HANDLED__CHAMBER_BRUSHES

[Klayface]

do you have anything attached to the receiver (SHell saddle or like b-SQUARE Mount)? if you do , the metal bars that go through it might be on to tight.

[rightside]

:what: I got out a fine grinding wheel for the DREMEL and.........no, I used patches/oil and elbow grease to wipe the chamber:D. I will be picking up a brush today. I have my sights set on the range and am going to give it a shot.
Oh, no attachments or accessories.
Thanks for the help.

[rightside]

Ok, shot 42 rounds today, 35 rapid fire with the last 7 slow. The 2nd, 4th stuck not bad but I had to give her another pull. The 6th shot stuck slightly just enough to feel it. After that functioned perfectly. It did not stick like before the recent cleaning, before it would seize up, sometimes thought I would need a screwdriver and hammer to clear. Hard to tell if it is the shell or front grip sticking. Best guess is the shell gets stuck. As mentioned earlier the bore and chamber are coated. So I will get to polishing the chamber some more and get busy cleaning it again.

Thanks for your help.

[dfariswheel]

At this point you should stop working on the gun and try some better quality ammo.

Some of the cheaper ammo made these days is notorious for causing failures to extract or sticky extraction.
Before doing anything else to the gun, go out and buy some premium ammo.
I'd bet your extraction problems suddenly go away.

[AcceptableUserName]

It could be a matter of putting 500 total rounds through. I don't recall you caying how much you've shot it. I assure you it's a fine gun and whatever's causing the issue is such a minor thing. Do this.

Then completely disassemble and clean. Polish the chamber with the barrel off, entering through the chamber side. If you have a Dremel, polish with patches very lightly oiled with Remoil inside. Do this for about 10-15 minutes. then swab the barrel until it gleams. Wipe off each individual pasrt inside the gun and LIGHTLY oil it - shell elevator, bolt assembly, etc. LIGHTLY oil the inside of the receiver before you reaseemble. Swab out the magazine tube as you would the barrel with VERY light oil until the patches come out mostly or completely clean. Reassemble.


Go buy a bulk box of Federal 7.5 from Wal Mart. 100 rds. Buy a box of Remington sluggers (5 rds) and a box of 00 Buckshot (5 rds) and go shooting. Shoot it all up. TRemember to use targets for your buck and slugs to learn and observe the pattern and MOA. Don't buy the Winchester ammo. That gave my 870 Expresses all kinds of fits. It could be decent ammo but my 870's, even my wingmaster, didn't exactly love it.

I BELIEVE the Marine Magnum is based on the 870 Express, only difference between them being a bit more weather proof kind of synthetic forend and stock (maybe I'm wrong) and the high-quality marine finish. Expresses are having some bit of issue out of the box (I've owend 2 both and both acted up for a while) but it WILL even out. It's a great gun.

[rightside]

Thanks guys.
Its has all been 2 3/4" Winchester 6 or 7 1/2 bought it when I got the gun, the ammo did spend a couple summers in the garage and it gets a little hot here:scrutiny: Around 150 shells left so I guess I will shoot them through, along with some new better ammo. I had forgotten how much fun a shotgun is to shoot, so gonna have some fun with it again tomorrow!
Thanks again.

[Fred Fuller]

Its has all been 2 3/4" Winchester

It's often the cheep Winchester stuff that causes sticking problems...

lpl