WASR-3 (5.56 / .223 rifle) failure to extract

Here's James testing out my WASR-3. It took us a while to figure out the metal of the chamber was heating up and I guess, tightening (swelling), thus causing a FTE after every 50-60 rounds. We had to try different ammo and mags to test it. Was a fun, yet frustrating rifle! Those Weiger 5.56 mags are really cool and well made. A bit expensive though.