Went to clean a new Carbon 15 for the first time before shooting and : 1. The bore is sooo tight. I could barely squeeze a patch down it...and from the muzzle end only. Would not go through chamber/breech. 2. The patches that did go through had metal shavings on them. Everything looks perfect except some "shadows" on the end near the chamber This is my first gun that has ever had a new chamber as well as first ar. Any recommendations? Call manufacturer? Shoot away?