In need of benelli guru

R

ryroru

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So long story short, my trusted sbe2 has become a bolt action jam o' matic. When a shot is fired the spent shell will eject but the bolt will stick back instead of moving forward and taking the new round off the lifter. A quick tap of either the charging handle or light press on the bottom of the lifter will send the bolt forward. The mag tube spring has lots of compression, I have replaced the lifter spring and recoil spring. Can someone who has experience remedying an issue similar to this provide any insight into my issue?

Thanks
 
Not a guru by any means, but on the face of it it has to be either a cleaning issue, including the possibility that something has gotten in the action, or a deformation of one or more of the parts. When I say that, I assume you are using normal powered ammunition that is sending the bolt back all the way in order to allow the action to reset and fully cycle- bad ammo exists, just ask any semiauto .22 handgun shooter. I would clean the gun again and change the brand of shells I was using, maybe to something that's higher brass if I was using target stuff.
 
Big Bad said:
Not a guru by any means, but on the face of it it has to be either a cleaning issue, including the possibility that something has gotten in the action, or a deformation of one or more of the parts. When I say that, I assume you are using normal powered ammunition that is sending the bolt back all the way in order to allow the action to reset and fully cycle- bad ammo exists, just ask any semiauto .22 handgun shooter. I would clean the gun again and change the brand of shells I was using, maybe to something that's higher brass if I was using target stuff.
Click to expand...

I've recently purchased a few different brands of ammo to try out, but wont be able to get out until tomorrow. If it turns out I can only use something like double a's I'm fine with that for matches, but it used to cycle damn near anything. The case of ammo I had at a match last weekend was verified (essentially) as completely full of duds.
 
May be worthwhile inspecting for brass filings in around the bolt catch? Mine makes its fair share and they accumulate toward the rear of the action though. I can only speculate
 
It sounds like the interface between the carrier dog and the bottom of the bolt carrier is locking up when the bolt carrier is fully to the rear.

Take a look at the surface of the carrier dog for any burrs or dents.

you can radius the carrier dog a bit to eliminate the possibility of it binding, but its kind of hard to describe.
Too much in the wrong spot can ruin the part completely.

When I get a chance, I'll try and take a pic or two or maybe draw something out and send it to you.

We need you up and running at 100% for the IPSC shotgun nationals!!
 
pauls said:
It sounds like the interface between the carrier dog and the bottom of the bolt carrier is locking up when the bolt carrier is fully to the rear.

Take a look at the surface of the carrier dog for any burrs or dents.

you can radius the carrier dog a bit to eliminate the possibility of it binding, but its kind of hard to describe.
Too much in the wrong spot can ruin the part completely.

When I get a chance, I'll try and take a pic or two or maybe draw something out and send it to you.

We need you up and running at 100% for the IPSC shotgun nationals!!
Click to expand...

I took the gun apart again and inspected the carrier dog closely, but did not find any defects. But at the same time decided to take the shell latch out as well, just too check. There was a small amount of debris behind it, so cleaned that up. Once assembled again it's better but still sticking every so many shells hand cycled.
 
pauls said:
It sounds like the interface between the carrier dog and the bottom of the bolt carrier is locking up when the bolt carrier is fully to the rear.

Take a look at the surface of the carrier dog for any burrs or dents.

you can radius the carrier dog a bit to eliminate the possibility of it binding, but its kind of hard to describe.
Too much in the wrong spot can ruin the part completely.

When I get a chance, I'll try and take a pic or two or maybe draw something out and send it to you.

We need you up and running at 100% for the IPSC shotgun nationals!!
Click to expand...

Silver lining is at least I have a new m2 on order, but would still like to have this gun running as a back up/in the interim.
 
Something has peened, deformed or shifted slightly and is impeding the bolt in its rearward position. Drop the trigger group, inspect the rails the bolt travels on and the trigger group itself. Spray everything down with a good degreaser. Does the gun have many thousands of rounds through it? Any unusual rub marks on the spring return rod? Look for any evidence of binding or rubbing,

If something is out of spec, you might need some new parts, not unheard of for autos.

Patrick
 
Perhaps try flushing the trigger group with some brake cleaner. Remove the barrel and cycle the bolt by hand. This should give you a better view of what is happening
 
So last night in inspecting things and cycling the gun in a variety or ways, believe there may have been something impeding the shell latch just a bit. Disassembled the gun completely, and brake cleaned the crap out of it, inspected everything to the best of my ability. Applied oil on all moving parts and rails. Testing today was good, score and challenger 7.5 1 1/18 1200fps loads cycled well with the only hiccups being a few failures to feed but they're cheap stuff so I'm thinking that's a qc issue. Win double a's had their own issue in that they weren't exiting the tube in the firing cycle, and I had to hit the shell latch to get them on the lifter. Something I'm hesitant to admit to is that in my hoarding I may have replaced the recoil spring with one that I had previously replaced, so I also changed that again (d'oh). I will start looking for a new shell latch as it may have slowly moved out of spec as well.
 
My buddies does that at least one duck hunt every year. I pull the can of rem oil out of my blind bag and give his bolt assembly a quick squirt and away to the races again for another bunch of hunts. After years of it he still thinks Benelli's are neant to be run dry?
 
the spank said:
My buddies does that at least one duck hunt every year. I pull the can of rem oil out of my blind bag and give his bolt assembly a quick squirt and away to the races again for another bunch of hunts. After years of it he still thinks Benelli's are neant to be run dry?
Click to expand...

Trust me when I say I've never been accused of running my guns without oil Haha.
 
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