Recently a Florida PD Swat team fired a Tromix 8" barreled Saiga 4,850 rounds of double aught buck without a failure. I received the gun back, disassembled the entire gun and inspected it. All still looked great. Though 5,000 shots isn't a lot, you have to consider the more violent gas system operation on such a short barreled gun. I seriously doubt you could ever wear one of these guns out.
Tony