This is a nearly new bolt carrier group I bought with a BCM upper a while back, and only test fired and zeroed it (probably 2-3 mags worth), then cleaned it and put it away. I have since sold the upper, so this was a spare for a while, and I am not using it. It was cleaned thoroughly after firing, and comes with the o-ring in case you need it. $135 shipped USPS priority mail. Payment by USPS money order or online payment (add 3.5%). IM to claim it, and ask for payment info. Buy with confidence, I ship promptly, check my feedback.