Bought a nice looking quad rail for my Saiga 12. Installed it and it sure looked great. When I took it out, the gun wouldn't cycle no matter where I set the gas adjust (has a reliability kit). Took it back off and it cycled perfectly. I also notice that the bolt move easier than with the rail removed. Must have been tweeking things out just enough to screw things up. The seller (Ebay) took it back and refunded me. Got some other furniture on order from CSS. Just wanted to vent a little.