gas ring 咋样?carrier能立住吗?
The biggest source of gas leak trouble is the carrier key to gas tube contact. With the bolt removed from the carrier and the charging handle removed, slide the carrier into the weapon and "feel" for any drag where the carrier key comes into contact with the end of the gas tube. You may have to gently bend the end of the gas tube to the point you feel very little drag when the key engages the tube.