Unscrew the butpad (phillips) then the stock bolt (flat bit) and the butstock comes right off. There is a special tool to remove the nut on the forend. I just used a stout flat bit and some extra oomph but YMMV.
I heard a spanner wrench does the job on their reviews on cheaperthandirt. Im really digging this...some people are saying there are minor things that are screwed up, like some discoloring, the recoil pad not being aligned right...I'm reading this and getting worried:
A great product and well worth the money once fitted, however I had to work a bit to make it fit my Mossberg 500: 1)The provided mounting screw was *barely* long enough (I could only get one and a half threads in the gun, without any washer… not a good idea). Solution: get yourself a 9/16 spade bit and a cordless drill to bore the hole a little further towards the gun, problem solved. Also, my kit did not come with a washer and the OEM washer was too wide… so I had to purchase a new lock-washer for a couple of cents. 2)The OEM sling attachment point (a screw with an eyelet on the end), when unscrewed from my old stock and screwed into the new one, protruded up into the bottom mag-tube of the stock, thus making it unusable. Solution: leave it out or get a hacksaw and shorten screw by about half. 3)Once the stock was mounted, I found that I could no longer drop the trigger assembly out of the gun (the first step in disassembly… rather important). Solution: remove the stock every time you disassemble the gun, don’t disassemble the gun, or (what I did) carefully grind plastic away from a few key points until the trigger assembly clears the stock easily. 4)Finally, there were a few rough edges inside the mag-tubes that caused the followers to hang up occasionally. Solution: get some sandpaper or a file and smooth the rough edges. As with most ‘drop-in’ products, the stock did *technically* fit out of the box… but expect to spend a little time adjusting it to your application if you want it to work well.
I know hes' talking about a Mossy 500, but I hope I don't run into the same problems with my 870.
I'm eager to get this...just reading up on some of these reviews makes me cautious.
Aside from that I'm not sure how that would work with me being lefty (lefty 870) and the left side of the mag tube being lower...does anyone think it'll hit my arm when I shoot...or my wrist?
Edit: Grr this is killing me...I'm finding some pics where the mag tube on the right side is higher, and others where it's lower...a video I watched showed the left side lower and the right higher...