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Which type of GG&G rear sling mount are you after?
I got a QD socket one from Wolverine and I am pleased with the quality and it gave me a longer trigger pull which helps with my long fingers. By that I mean literally longer for my finger not the overall LOP. I found the Magpul SGA stock to be too close to the trigger for my hand size.
I ordered this one from Wolferine, GGG1380 GG&G Remington 870 Looped Front Sling Attch , I am using the spec ops stock and when I went to mount it to my Grizzly there was a gap between the receiver and stock so I am thinking this should fill the gap.