OK, I have sold both of my 870s and got some benelli novas because of problems with them jambing but my dad still has his 870 12 gauge because he does not want to spend money on a new gun right now. But last Sunday when we shot are guns to prepare for shotgun deer season, his chamber came open every time he shot. We only shot it four times because we dint want something to really go wrong but when you cycle the empty shell out and the new one in it did latch in and would not come back but when he shot the chamber and pump came 1/2 way-all the way open. I cleaned the gun extremely thoroughly including taking it all apart and cleaning everything hoping that would help but we tried shooting it again and the 2 shots we fired had the same problem. I'm no gunsmith and don't know whats going on so any help would be appreciated.
thanks, Tyler
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deerhuntertyler: Sir; I post all this information; in hopes you'll find the answer. I too have an 870; not any issues; but would like to hear how this one ends.
I have several 870's and they all do that, are they designed to be that way? if the bolt locking mechanism was not released by the recoil you would have to push the locking release button every time you shot a round, just like emptying the chamber of an unfired round.. Is there something wrong with your gun or your dad's gun. Are you holding on to the forearm when you shoot? or are you shooting of a rest and not holding the forearm?? That could cause the problem you are having..
Last edited by rimfirenut; 10-23-2009 at 03:36 PM.
And I have several Rem. 870,s and mossy 500,s and other model pumps and none of them fly back.When the barrel is the right length to allow the damn bolt lock to fully enguage they dont fly back. ,,,sam.
And I have several Rem. 870,s and mossy 500,s and other model pumps and none of them fly back.When the barrel is the right length to allow the damn bolt lock to fully enguage they dont fly back. ,,,sam.
So, is there something wrong with my 870's also?? My friends also does this, is it hurting anything or are we alright to keep shooting them, I have been shooting them for years this way..
It has been my experience that well worn 870's will do that IF you do NOT hold the forends while shooting. Check the locking block on top of the bolt and check the notch in the barrel where the locking block goes into. Make sure that it is clean. Make sure the slide, which rests on the action bars beneath the bolt, is in good order. That makes the locking block go up and down when it goes back and forth. If that is damaged, the locking block will not go up all the way. The notch in the barrel where the locking block goes into might be peened over or worn. Remington will tell you to just send it back. Take it to a gunsmith and have them look it over. Make sure every part is clean first, that is the cheapest fix sometimes. Let us know.
Take the weapon and make sure that it is empty, check it again. Work the action and cock the gun. Hold is straight up, not holding the forend, and pull the trigger. The slide should go just a bit back. Well worn 870s will go an inch or more when you do that. Action bar lock could be bent or worn also. That is the part that locks the action bars until the gun is fired. Slide release button in front of your trigger guard, all the same piece. The other end of that locks the action bars. That could be bent in or worn. Could be just a weak action bar lock spring.
I have owned several 870's and have one now for self-defense.
I have just never had a problem with any of them.
I do give a solid push and pull for operating the mechanism.
I am not saying jam it forward with all your strength. Just give it a solid push and I have found mine to lock up all the time.
I own several 870's. One is a very well used 3in. mag.-an older one. One is my granpa's old 870 bought in the early 60's and shot many times. I have never experienced a jam or any kind of malfunction in any of them.
I work for an agency that has about 900 members all of whom are issued 870's, and as an instructor for over twenty years I have seen many thousands of rounds fired through the 870 (buck, slug, and bird) rapid fire and slow fire from many different shooting positions, and that is a new malfunction to me (I am not an armorer on the 870). Almost all the malfunctions I've seen on our ranges are shooter induced and the primary shooter induced malfunctions I've seen are short stroking, or failing to push the shell far enough into the mag for both shell latches to catch it causing a double shuck. Our 870's range from 30+ years old to brand new.
If you get it diagnosed please let us know what the cause was.
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I sound like when you push the forend foward your bolt lock on the inside of the bolt isn't locking on the top of the reciever and causing it to blow the action open when you fire the round take the reciever apart and inspect the bolt lock and the reciever where the bolt locks into it never experinced this with a 870 but i have with a brand new win 1300 the first time my friend handed me the gun and shot it i shit my pants and hurt my wrist it didnt just open it cycled it all the way.
I sound like when you push the forend foward your bolt lock on the inside of the bolt isn't locking on the top of the reciever and causing it to blow the action open when you fire the round take the reciever apart and inspect the bolt lock and the reciever where the bolt locks into it never experinced this with a 870 but i have with a brand new win 1300 the first time my friend handed me the gun and shot it i shit my pants and hurt my wrist it didnt just open it cycled it all the way.
The lock on an 870 is in the part that extends behind the breech on the barrel,not the receiver. ,,,sam.
You say the bolt is locked in. I don't see a problem because the bolt is suppose to do what you describe.
IF the bolt violently slams back when you shoot then there is a problem. I guess it's possible that a milling machine was out of spec.
I've got 4 pumpaction shotguns. When I shoot any of them the bolt unlocks BUT I have to work the forearm to eject the spent shell and of course reload the chamber.
Your saying his chamber came open which we know you mean to say the Bolt.
Your saying the bolt went all the way back/open and the forearm would to ? When your Dads shotgun is fired ??? It should 'nt do that so something is a miss.
What does your Bennelli do after pulling the trigger ???
I'm wondering if the trigger Mechanism was pulled out and reinstalled without getting the rear end of the action bar lock below the end of the left connector...If not , it will not function properly...
Rich
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After the gun fires it should unlock but not slide.Possibly the heavy recoil from slugs
may cause it to slide alittle.My express(a total pile) Would jam after firing,locking up
empty shell in it.I found a burr on the locking lug and polished it off and it helped.
I have a old wingmaster with a cracked stock so I stripped the action and trigger and
installed them in the express.Now its a shooter with smooth action and a good steal
trigger...
if the jamming issue is in trying to cycle the next round quickly, I've fixed this issue before on some express 870's. the locking lug and the locking groove have very sharp defined areas in the milling process. some have small burr's remaining. using a file and breaking the sharp edges slightly have fixed this problem.
as far as the action coming open, i've never tried this with an 870, but if the forearm is unsupported and untouched on my Mossberg 500 it will open partway under recoil. theres no fault with the gun, the action becomes unlocked after firing and if there is still residule pressure in the barrel it will travel the bolt back a bit.
My 870 Wingmaster action opens when unsupported on a rest with Slugs. Not noticed whan supported with the left hand in normal shooting. I believe the extra slug recoil is accurate IMO. With light or standard field loads it just unlocks and opens a very slight bit. Iv'e looked over my very well maintained 870 since the start of this post and find nothing mechanically wrong. Note action open with smoke rolling out, left hand tucked back under gun butt stock. Again, does not do this with field laods.
Here is a pic shooting slugs off the bench with a rest. I did not manually pull the forearm back on this shot.
Remington 870 
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