I have just added an extra check to the sniper, to prevent bullets going through walls as in Fares' video. Now, for cars, you have to keep in mind that not everyone sees the car in the same position. An easy example is when you fall off a bike with a passenger, you'll usually both go another direction, until one person gets on it, then the other person sees the bike 'teleport'. So, vehicle positions aren't synced 100% in SAMP, that means hiding behind a vehicle is not always a good idea (the other player might see the vehicle in another position, and have a clear shot on you). This fix doesn't work on vehicles, only objects, so keep that in mind.