I bought a Saiga 20 gauge that already has some upgrades, Zhukov stock and an updated grip. It fires ok but has cycling issues So I figured I’d tear the gun down to see if it’s had any of the problem parts switched out, gas puck, 6 position gas regulator ext. I noticed it only has the stock 2 position gas regulator plug, I removed the plug and I pulled the bolt and everything out and popped the puck out. I noticed that there was a thick cleaning patch wadded up in between the puck and the regulator along with tons of nasty build up , witch I thought was very strange. I cleaned up all the parts