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Does anybody run their M4 without the top rail?

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There are a few examples of SAE / metric thread sizes being interchangeable; 8-40 and M4 x .75 coarse thread screws are within a few thousandth's of each other; certainly for plug screws that have no tension, they are suitable substitutes and much more readily available. It's the only threaded part on the Benelli I know of where SAE can be used. There are some third party reports the factory specifies a 8-40 thread however I have never seen it in factory documents.



Edited by benelliwerkes
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  • 3 years later...
On 12/27/2016 at 5:24 AM, Banshee said:

I ordered from Brownells


Positive Stop Refill Pak, 8-40, Blue, 1 Dozen




Edited by adalah
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