Originally Posted by Dart
Shredder concave nub. One of the best upgrades you can put into any AEG
put one in my KWA G36 with the K conversion kit and was getting with a 0.25gr bb a flat shot out to 100ft with the hop-up all the way off. With it tuned just right and the same weight bb, was placing shots threw 1-2" gaps at 150ft, and kill shots in the open at almost 200ft.