Since the aftermarket on these guys can be so tricky to navigate. Thought I would get a current list of manufacturers of aftermarket items for our beloved rifles. Feel free to add manufacturers you might know of. I'll post links to the harder to find companies.
Bonesteel Arms/CNC Warrior - American-made muzzle devices, railed handguard, U.S. trigger group, stripped receivers, pistons.
D-Force - Czech manufacturer of rails, folding stocks, muzzle devices, etc.
FAB Defense/Mako Group - Israeli-made polymer stocks, fore-ends, and magazines.
GuneXpert - Czech manufacturer and distributor of rails, muzzle devices, stocks, etc.
http://www.vz58rifle.com/ They also have an eBay page.
Polenar Tactical - Slovenian distributor of muzzle devices, bolt release, etc.
Spectre Ballistics International - Canadian manufacturer of muzzle devices. Possible M-Lok rail in the future.
CzechPoint USA - American distributor/manufacturer of VZ rifles. Good selection of spare parts.
RS Regulate - American-made VZ optic mounts for the side rail.
PRI - American-made railed upper handguard