I've recently finished my DMR ICS build and seemed to work correctly on the tests I made over short range and the chronograph, but taking it to the field I observed two issues: The first noticeable issue was that the BB curled left on long distances, the movement was like a parable, not straight. The longer it flied, the left it went. So it was kinda impossible to hit anything over a long distance. There was some wind at times, but I find weird that the BB always spun to the left. Another weird issue I had is that upon changing magazines, due to the current one being empty, the BB just flew out of the barrel and dropped dead (like if the hopup was maxed out). I had to manually adjust the hopup for each magazine change and even dropping the hopup to min didn't guarantee that the next shot flew correctly. Its like if the rubber wasn't warm and took a couple of shots to get its temperature, but I find weird this happening just at mid match, also there was like 10-12º C, so it wasn't so cold to make the rubber stiff. Upon the above two issues, they look to the hopup unit or rubber, but is there anything more to look for? Any idea what can cause the left curl over distance? I mean, to go up or down its kinda straightforward from the pressure of the hop, but I don't recall right now what could cause that left movement.