This barrel came off of my AIAE MK3. It is a 20" 308 win threaded 5/8-24. There are no markings on it and I don't know the round count. I have put 150 rounds down it. Looks like a light Palma weighs and 3 pounds. Barrel shoots great with Varget and 155 scenars.$150.00 shipped. PayPal G&S or...