If you have not heard of the Taiwan-based Magic Box, owned by well-known airsoft gun smith and airsoft practical shooter, Mr. Fan who also owns the TOT Shop, then you're not deep into airsoft gun smithing or modding. The Magic Box line is known for great airsoft upgrades such as crazy rate of fires of airsoft guns that they customise. Now Mr. Fan makes the Magic Box Miracle Barrels which are said to give you great ranges for your airsoft rifle which Airsoft GI in the USA.

Spartan1117gw goes over this line of inner barrel so find out what he thinks.