maple leaf aeg inderlob 250 mmHere we have a Maple Leaf inner barrel that is produced in really good quality. The barrel is produced from chrome plated brass and has a diameter of 6. 02 mm, which provides precision when shooting. Precision barrels provide better compression around the bullets, which provides better accuracy when shooting and can also increase muzzle velocity slightly. Keep in mind that precision barrels require a little more care, including cleaning the barrel.