Andrew863

So good news boys. This thing ran like a champ today. Since I put a new inertia spring in, I did a little break in with three boxes of high brass. Not sure if I needed to, but I did. Then went to Federal bull pack 3dram eq with 1 1/8oz shot. They ran perfect. I ran 300 of those. Then I also shot 3 boxes of 2 3/4 dram eq with 1oz of shot. Those ran perfectly as well. Usually my issue would happen after 2 boxes, but it didnt happen today. It made me love this gun all over again. We practiced some trick shots doing 3 hand tossed Clay's and hip shooting Clay's out of a thrower. I thought if it going to mess up it will be now when it's not planted well on my shoulder. No issues. Then at the very end I did 2 mag dumps of 14 rounds as fast as I could go. This gun has never been able to keep up with my finger. It ran perfect , its super dirty after over 400rds and still perfect. The only thing I dont like is that I'm still not sure what part or parts caused the issue. I may try just the new bolt head next time I shoot and see if I can out run the trigger again.

Yes sir, it is there.

Yea the more I thought about it the worse the idea seemed. I did a slow mo video with a 3in slug and it has no bounce at all. So the added weight helped. So I'm thinking about adding the weight on the carrier if I have any more issues. Were having a clay shoot this weekend so I'm going to give it a test. I'll shoot 300-400 rds that will let me know one way or another. Thanks everyone and especially kurtm for all the help.

So where I'm at now. I have replaced all the internals. Complete bolt and bolt head, pins and springs. The trigger group and firing pin are the only stock pieces in the gun. Doing a slow mo video it still has a small bolt bounce but from what I can tell they all have some ( correct me if I'm wrong) but the bolt no longer rotates out of battery just has a small bounce. I'm considering adding the weight that moa puts on there carriers to see if that helps and maybe the low recoil spring from them but I dont see that helping me at all.

So from what I understand removing that shoulder that the cam pin rides in will speed up the carrier and cause more bolt bounce. I have ordered all the internals so I will have a spare to play with. Maybe u can explain what your thinking but it seems backwards to me but I'm all ears.

Figure i'll toss out a little update. So I went to Uncle Lee's AKA buds guns shop and looked at 10 to 20 Benelli's and Stoeger's and none of them had this cut that the guy on the phone had talked about. He had to have been talking about the ramp that the extractor rides on. He made it sound like the tip of the extractor claw would have a small groove on the ramp to grip but out of several guns none of them had this. So I had a friend of mine that had just purchased a Stoeger P3500. Its insane how close they are to the semi auto version. Anyway I took the bolt head and cam pin out of that and put it in the m3k and it cut the bolt bounce in half. I then used the complete carrier and that made the problem go away at least in slow mo video. The only difference in the pump version is that it didn't have the hole for the bolt handle, so i just locked the bolt back by hand and then dropped it on a loaded round. So I have ordered all the internals other then the action bar, firing pin and trigger group. Surely this will take care of the issue or get me going in the right direction. If this don't take care of the bounce I will try the MOA weight that welds onto the action bar. I wish I could upload some of the slo mo vids to show you the issues and the progress where it is with the pump bolt and carrier. Do these guns have a small amount of bounce all the time? I just cant see how it wouldn't. Wish they had a buffer of some type like a AR.

Pat Cottingham was one and not sure the other guy. Does the Benelli have a groove the the extractor grips when the bolts closes?

So I just talked to a Benelli/Stoger gunsmith. He asked a bunch of questions and finally got him to understand I have checked all the small stuff. Then he said there is a ramp on the barrel for the extractor and there is a groove that the extractor goes in. He said is that groove wore. Well my extractor has not gone in that groove since i have had the gun. I thought that was just extra threads from the barrel extension. He said they will have to cut that grove in the barrel. I'm a tool maker and can do it but the gun is only 3 years old I'm just going to let it go back to them and see what they say. I have never sent a gun back to the factory but i would rather let them do it and maybe they will cover the other parts if it's not.

Yea sir that is correct. The locking head( AKA the bolt) and the locking pin that holds it in the carrier is what controls the rotation. The carrier just holds the pin that makes the locking head rotate. I may give that a shot. U can get a new locking head for 30 and the pin is like 10. For 40 it's worth a shot. I may go ahead and order a inertia spring and recoil spring while I'm at it. One thing nice are parts for these things are super cheap. I bet a a complete Benelli bolt on there was 600. Thanks again u have been a huge help in getting me going in the right direction!

I'm going to have to do some research and see what I come up with. I just dont see how the carrier could be wore out. It's done this from day one unless it was out of spec when I bought it new. I'm going to play with some springs and see if I can figure this out. A complete bolt and carrier online is 150 so atleast they are cheap for a stoeger.

Well you hit the nail on the head. Got a super slow mo of it locking and unlocking completely then going back into battery with a tiny bounce and no rotation after that. I think I'm going to order the low power recoil spring maybe. Not really sure what to try. I tried pulling the plastic spacer behind the recoil spring to remove tension and it still bounced about as bad as with it. So I'm not sure what to do. I havent messed with the locking lugs or really anything that should affect this. Might should have sent this thing back when I first got it.

Thanks again. I for sure still have that step and havent touched any of that. I have polished the extractor and the ramp on the barrel for the extractor and the carrier that rides on the mag tube but all of that has micro slick other then the extractor. Might try one of the lighter recoil springs from moa.

Never thought of that for some reason. I always check for bounce in ar's not sure why that didn't cross my mind here. When I get home later i'll get some super slow mo's with my phone and see if it is bouncing out of battery. It's like a light bulb come one as soon as I read this. That make all the sense in the world. I have been chasing the other direction the whole time I have had this gun. The only thing that gives me just a little doubt is it only happens after a box of 2 when the gun is dirty. With that said it could also be because the gun grease and oil I use is warm and the viscosity is down allowing the bolt to slightly speed up from time to time allowing it to bounce out of battery. Say this it the case you think I need to get a recoil spring?

So I assume your talking about the spot on the bolt itself that the pin rotates in the slot. What are u doing to that area. Mine is super smooth already but I haven't done anything to that spot but it is coated with micro slick.

I have had this gun for a couple years and have probably 1k rounds threw it. The day I got it I cleaned and de burred all the small stuff, added a 8rd Noridic comp tube and follower and took it to the range. Shot 200 rds of heavy loads and it ran like a champ. With light loads I have always been able to shoot 2 maybe 3 boxes and then start running into every 10 or 20 rounds it will not go all the way into battery. It don't mater if I use the cheap Federal bulk pack or good AA's it always the same. I tried to polish everything that has any friction the gun was smooth as silk but I still have the issue from time to time. I took the gun and had the bolt and carrier coated with micro slick dry film. Again the gun is silky smooth but still have the issue from time to time and the crazy thing is I can run the 1145 FPS loads in this gun fine but the not going into battery issue still happens even with 1200 FPS loads. I hope someone can help me with this issue. I love the gun but man it gets annoying constantly checking to make sure it went all the way into battery and getting a click from time to time.