Designed to be a straight fit onto the Tiger Model kit.
The TM model has an incorrect barrel with two rings near the fume extractor. This corrects the problem and adds a fume extractor with a textured pattern, typical of Leopard 2A4 which Revolution is based on.
Remove the casting gates CAREFULLY. The fume extractor has a small hole at the front which needs to be drilled out to 3.2 mm. Drill this from the INSIDE/the rear. The rear has a wider opening to fit the kit mount. Carefully align the parts. There is a small amount of play in the fume extractor to help you with this. The sight on the collimator goes on the right side, not the top.
Incorrect ring on Tiger Model barrel
purchase at MBK