That said, installing one on a Saiga is a royal pain, and needs a competent gunsmith. The original front sight block has a shroud that goes over the end of the barrel. This means that you have to replace the whole front sight assembly. The pins need to be pressed out, and the original front sight block pressed off. Then a new standard AK sight block needs to be installed and shimmed so it fits tightly. Then either the barrel needs to be threaded or, if you installed a sight block designed to take a muzzle brake, you can just screw the brake directly onto the block.
Yeah, I looked into this a lot. It's totally not worth the effort and expense. This has real potential to permanently mess up your gun, far more so than a simple Saiga conversion.