quote:
All I need to switch out is the buffer and extension tube, right?
Yep. You'll need the ~$4 castle nut wrench that Rock River makes to tighten down the castle nut on the new buffer tube. A magwell block the you can clamp in a vise will be needed too, but you can get away with using an appropriately sized piece of wood. I would get a Magpul MOE Milspec kit. Put a bit of blue loctite on the lower receiver threads and on the tube threads next to the receiver when you tighten the nut down.
Be sure and watch out for the buffer retainer when removing the old buffer tube. It will fly out with great force and you'll either never find it again or have it stuck in your eye. Simply press it down with your thumb when unscrewing the old tube. Reverse the process when installing the new one.
quote:
Any reason why I shouldn't do this, or should choose a different style of upper?
Nope.
[This message has been edited by Log (edited 3/15/2011 2:54p).]