Off the barrel?
From what I can tell there's about 8 allen screws that should easily come off - though I'm certain they're torqued pretty good - they should still come loose. You'll need to disassemble it to get the lower half off.
I bought a complete topcover when I bought the JAE stock but I kinda like the mount - it looks more agressive - though I'm sure it would drop a few ounces off the weight of the rifle.
But without a complete topcover you'll have a big rectangular hole there if you remove it.
"I'm completely in favor of the separation of Church and State.
My idea is that these two institutions screw us up enough on their own,
so both of them together is certain death."
- George Carlin
.308 Springfield M1A (with JAE custom stock
) - .22 Scoped Marlin bolt action - 12 gauge Mossberg 590 (combat customed) - 9mm Springfield XD-9 - .40SW H&K P2000 SK Subcompact V3 (my carry-on) - .40SW Walther P99 QA - .357 Taurus Tracker w/6.5" barrel - 5.7x28mm FN Five-Seven