Not hard at all. Chances are you have a pinned forend, if you do this means you will need to change the action tube along with the forend.
Heres a pic of the forends,,,,,
There Are Now Several fore end/Tube Assemblies Available, It's Simple Swap. You Can Install A 6 3/4" Regardless Of The Slide Length. Here Is An Example http://www.ebay.com/itm/350992337814
I have an interesting bit to add to this conversation my 20 gauge maverick 88 came with a foregrip nut I've never actually taken it apart but I'm getting my Magpul furniture in a couple days (SGA buttstock and moe foregrip) and I don't think I'll need the tube adapter because I have no pins in my foregrip and the nut already but we'll see I'll keep you guys posted
I'll post pics for sure. I'm not 100% sure of my plan but everything else I've seen says it needs that nut and if you're action is pinned you need the other reciever tube so we shall see how it's goes fingers crossed I don't need either
Well I was able to adapt the butt stock as I knew I would be able to but I still need the longer action even though the original isn't pinned it's too short for nut to be able to screw to the tube with the spacer they provide for the fore grip so if anyone has a link to it I'd really appreciate it.
I have tried a 7-5/8" and a 6-5/8" forend action slide tube and neither of them work for my 12ga, Maverick 88 20in Barrel. The arms on the action tube look are too long compared to my stock single piece molded forearm to engage the cartridge stop to feed the elevator assembly. This prevents the new round from feeding when ever I use the pump.
From everything i've read, this swap out should have been simple. I would really like to minimize the machining need to get this tube to work. My only idea now is to use the slide tube arms from my existing forearm and trying to mount them on the 7-5/8" tube assembly I now have.
Can I ask what the length of your action slide tube's arm is from the collar to the end of the arm is?
Where did you get your action slide tube?