Change the FCG. I had one, a Polish underfolder, that was beating the living crap out of my cheek. The FCG had the disconnect hanging on the hammer. I got the fix information off AKfiles.com and was amazed at how smooth it was after changing out the entire FCG with a Tapco.
Early WASRs had horrible FCGs that Century put it n before they switched to Tapco G2s. The first WASR I had about 2007 was terrible. They were awefultripper slap nd jump. This has a G2 FCG in it already.