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AR15.COM
3/14/2016 12:32:50 PM EDT
Click here for my vid: https://www.youtube.com/watch?v=APkYw8CUGjA
 
I may as well be just some dude in his mom's basement with a dremel, but I figured I'd record the process and maybe it could be of some use to someone who wants to jump in and DIY.
 
If you can't fathom ruining a receiver, send it off to the pros.  But how you want the loading port shaped seems to be pretty personal and DIY might be the only way to get it right for you and your style.
 
I used a Franchi Affinity in this video, but it's much the same process for most shotguns, especially the Benelli M2 and Stoeger M3000 or M3K.  There will be different caveats depending on serial number placement and how the follower is retained.  I noticed the other day that Stoegers seem to have a 360 degree rib that retains the follower, whereas the Franchi and M2 have more of a 270 degree retention rib.
 
Thanks to Jesse Tischauser for his video series on this subject that got me started on doing it myself.
3/27/2016 11:38:21 PM EDT
[#1]
Thanks for this, I am just now looking into how to do all of these modifications.  This was helpful, thank you for taking the time to do it.
3/30/2016 5:10:41 AM EDT
[#2]

Good job!
We are in a race to the bottom, and everyone is cutting in line to get there
4/1/2016 11:43:18 AM EDT
[#3]
Thanks.  I want to emphasize that this is just one way to do it, and I was moderately conservative in terms of how much material was removed.

The same procedure could be used to make a more or less aggressive modification to suit your taste.  I watched several videos and read several tutorials, and after experimenting with a carbide burr in the dremel vs. a file settled on using the burr exclusively for the bulk material removal.  This video is an amalgam of the techniques I learned.

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