Had my ar about a year, only put about 50 rounds of various ammo through it. No problems at all, and this rifle is my most valued personal possession. However, a police armorer (trained and schooled) looked over it today and said the bolt was very tight in the carrier, to the point gas rings were damaged and needed replaced. Is this normal for a current civilian ar, just needs more shooting to break in (and it is and has been properly lubricated)?cwd