How are the brackets that make up the stock on the bullpup attached? riveted? bolted? other? Could the stock, including the brackets not just the pad, be easily removed leaving just the squared off back end?
the buttstock is screwed onto the same frame tongues as would be a normal stock. the pistolgrip element hooks onto the front edge of the frame and is securely swivel-latched onto a piece of furniture pinned to the barrel, which once held the lower element of the original fore-end. the kit's fore-end element IS loose, and is slated for replacement when I get around to it.
The original kit sights sucked. you will note that mine has no front sight at all, and has a shiny aluminum adaptor/mount where you'd expect to see the rear sight - those are two custom mods I've worked into my bullpup.
On the other side is a rapidly detachable brass catcher (90rnd capacity) and a forward auxiliary charging rod and handle (as the brass catcher renders conventionally operating the bolt impossible)
Internally, I cut the trigger wire and inserted a 40tpi screw with nuts to make a trigger poundage adjustment. I wish it was accessable without a complete teardown, but oh well...
oh, and there's that nifty muzzle brake. damned good item, that. got it from Bushmaster.
with the current set up, I shoot 3" groups at 100m freestanding.
that's good enough.