I have the ICS L86 A2, it has an adjustable spring so you can change the FPS but just changing a pin placement in the back of the gearbox. it shoots at 350FPS - 400FPS - $430FPS at the 3 different points you can set the pin. the gun shoots hard and straight, Having the A2 gives me a longer barrow so the grouping is super tight on semi and pretty good when running full auto. the only thing I found is the hop up arm is made of plastic, im planning on replacing the arm with a full metal one at some point but haven't had any issues with the hop but yet. I have put about 30,000 rounds through this gun so far and everything is still working strong.