What Forends WON'T fit a Grizzly MAG 12.5"?

Uberfiend

CGN Regular
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Location
Calgary, AB.
Thinking of getting a 12.5" mag fed for a build, want to know my options without trial and error. Which 870 forends/accessories definitely WON'T fit? Thanks.
Über
 
12.5 has the normal length action distance right? (IE: same as 18"?) I found that I had to cut away some of the ATI one but the Fab defense railed one works.
 
None will fit without fitting the tube on the grizz is just a touch bigger so the forends need to be sanded a bit.
 
^^ + 1 all/most will require enlargement of the hole.

But some fore ends are longer and when racking it back the rear of the fore end will hit the mag well. That's what was happening with the ATI Tactical one. I cut some off the back. A 870/Grizz with a tube mag can have a longer fore end because there is no issue with it sliding back over the feed ramp area.
 
There are three relatively close together on my grizz. two were used for mounting the rear ghost sight. the third was unused between those two. Not sure on the thread diameter/pitch. But seeing as they seem to use the closest metric one to the original remington NC/NF standard one it may be slightly different. I am away working otherwise I would check it out for you.
 
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