Wear under ejector

[onlybennellis]

Is this wear under the ejector on the m4 normal? I don't seem to have any major issues, the bolt rides smooth probably because it's worn in, I have about 1000 rounds on it. But I do have the occasional failure to eject on the last round, so I wonder in my bolt position is slightly out of spec. 

Edited March 18, 2025 by onlybennellis
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[Franklinexpress]

I would just email Benelli to get a correct answer. 

[onlybennellis]

I did, haven't gotten a response yet. I'm just trying to see if anyone else has this wear.

[Franklinexpress]

Question, did you mess with the top rail at all? Check if the top rail screws are protruding and pushing the barrel insert down.

[onlybennellis]

1 hour ago, Franklinexpress said:

Question, did you mess with the top rail at all? Check if the top rail screws are protruding and pushing the barrel insert down.

I think that might be it. Thanks so much! Looks like the screw that is supposed to be second to the rear is slightly shorter and flatter on the bottom than the rest, never would of thought one out of the five was slightly different.

 

[Franklinexpress]

29 minutes ago, onlybennellis said:

I think that might be it. Thanks so much! Looks like the screw that is supposed to be second to the rear is slightly shorter and flatter on the bottom than the rest, never would of thought one out of the five was slightly different.

 

Awesome, you’re welcome. 

Edited March 22, 2025 by Franklinexpress
Added you’re welcome

[RxArms]

4 hours ago, onlybennellis said:

I think that might be it. Thanks so much! Looks like the screw that is supposed to be second to the rear is slightly shorter and flatter on the bottom than the rest, never would of thought one out of the five was slightly different.

 

Those OEM screws are all the same

[Franklinexpress]

18 minutes ago, RxArms said:

Those OEM screws are all the same

How do you know they are OEM?

[RxArms]

12 hours ago, Franklinexpress said:

How do you know they are OEM?

You have good point 

[onlybennellis]

7 hours ago, RxArms said:

You have good point 

They were oem, one of them was shorter by a little bit, I dont know if the do some hand fitting? The screw protrusion seems most important to that second to last hole though l, all the others have much more clearance, I probably over tightened them as well before.

[Franklinexpress]

2 hours ago, onlybennellis said:

They were oem, one of them was shorter by a little bit, I dont know if the do some hand fitting? The screw protrusion seems most important to that second to last hole though l, all the others have much more clearance, I probably over tightened them as well before.

Yup easy to tighten past the end, and into the receiver. It’s a known issue.

Edited March 24, 2025 by Franklinexpress
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