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I need help with Benelli M4 buffer tube installation please


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I was removing the civilian 1 position buffer tube of my Benelli M4 to replace it with an MIL Spec buffer tube. 

But I forgot how deep I need to screw the new buffer tube in.

If you can tell me or show me how far the buffer tube needs to be screwed it, I would be very thankful.image0.jpg

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You want 8.5 full rotation from the point the threads grab. Then time it so that the collapsible stock is indexed correctly. I collapse the stock onto the receiver extension and use the pointy part of the cheek rest to point at the center of the rear sight. I then tighten the jam nut with the open end of the 27mm wrench. Then remove the stock, slip the close end of the 27mm wrench over the end and firmly tighten it while putting counter pressure on the extension with a 19mm wrench on the flats of the extension. Verify that the extension didn’t move with the stock again after tightening.

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