Check it out. Ruger 10/22 bullpup conversion with walnut Steyr AUG stock.
Practical? Beats me. Pretty nifty, though.
FWIW, someone on The High Road had good things to say about the item just below that at the link, their combination extended mag release and bolt hold open. “A true extended mag release drops mags fast and clear. Pull the lever back while holding the bolt open, effortlessly activates bolt hold open.”
I really dig the looks of the Tactical Solutions magazine release, which has that falling block lever look. TacSol makes all kinds of 10/22 accessories, from receivers to lightweight aluminum barrels with steel cores and threaded ends. They even make suppressors to fit on that threaded end.
For .22 pistols TacSol has lightweight aluminum barrels with steel liners and optional threaded ends and scope rails: the PacLite for Rugers and Trail-Lites for Browning Buckmarks. I’ve shot Dave D.’s Buckmark with a threaded Trail-Lite and liked it a bunch. Every TacSol barrel I’ve handled has had unusually good machining and finishing.
Volquartsen, Tactical Innovations, MOA, and Tactical Solutions make 10/22 receivers. Someone else has one with a Picatinny rail and hooded AR-15 rear sight. Darned if I could find it in a Google search, though. If you know the link post it in comments. LATER: jcmiller in comments found it: NoDak Spud NDS-22 receivers. They’re affordable, too, at $160.