Apparently a company called Center Balance Systems will sell you an aluminum bullpup stock assembly for your old surplus Mosin-Nagant rifle. They cost $270, and enable you to... well, do something bullpup-ish, I guess.
I'm wondering if there's a special hardened area around the action for when I'm having to knock the bolt handle open with a chunk of 2x4 because I was shooting cheap surplus 7.62x54R ammo.
I'm also wondering if somebody is going to try putting an M38 or M44 carbine in there? Because that'd put the muzzle blast, like, a foot in front of your face...
(H/T to Unc.)