I was curious what people like.

I used to have a G3-style rifle with the "Navy" polymer lower with smooth, fixed grip. I did not like it. Selector was too far away, didn't like the texture and didn't like the shape of the grip itself.

The old metal lower grip feels good, but I haven't felt one attached to a rifle.

And isn't there an extended selector available? What lowers does it fit?

I've looked around but can't find a run-down on the pros and cons of the various HK lowers.