Made by the Chongqing Jianshe factory in China that makes SMGs for the Chinese PLA and PAP. Cue the jokes about it being the Ching-Chong shotgun.
They're pretty reliable from what I've seen but just make sure you are using hotter loads. Pretty much like any gas operated shotgun. Also make sure your mags work well with your gun. Saigas are pretty finicky with mags iirc.
Just in case you get someting that fails QC, JTS will pay for shippng both ways and for the FFL fee (I'll write a writeup on the X12pt later)