Besides the obvious truth that one is powered by a spring, and yet one is powered by gas, there are in fact some other significant factors as well. But above all else, it is reasonable to say that the largest difference between spring and gas powered air rifles is usually the cost.
Also, another important thing to consider about gas airsoft guns is the simple fact that they almost always shoot at a higher velocity than a spring airsoft sniper rifle. Generally the higher end spring airsoft sniper rifles shoot around 450 FPS, while the gas airsoft rifles generally shoot at 500 to 550 FPS. It is also worth noting that a bolt action gas airsoft rifle is far simpler to cock than a spring powered rifle; this is because with a gas airsoft rifle there is not any heavy duty spring to cock back for each shot. You still have to pull the bolt using a gas powered rifle, but it is much easier to operate.
Another very important thing to consider is the fact that all spring rifles are only shot only, meaning they need to be cocked for each shot, though a gas powered airsoft sniper rifle could be semi automatic. However, many of the gas sniper rifles continue to be manufactured as single shot bolt action rifles, making them much more realistic. And again, the single injection gas powered airsoft rifles are significantly simpler to prick than the spring airsoft rifles. This may not seem very significant, but it can definitely make a difference in airsoft games where you end up doing a lot of shooting. You would not want your arm to become tired through an airsoft fight!
There isn’t much evidence to really support any differences in accuracy between the 2 types of airsoft rifles, however it is safe to say that you should probably be using slightly heavier airsoft BBs with a gasoline powered airsoft sniper rifle, on account of the fact they generally shoot at a higher FPS than the spring powered airsoft rifles. The faster an airsoft rifle shoots, the thicker the BB you will want to use, to achieve maximum precision. This is particularly true at longer distances.
If you have the excess money you may want to think about a gas airsoft sniper rifle, even since they shoot a bit quicker compared to the spring airsoft sniper rifles, and are easier to penis also. On the other hand, the spring airsoft rifles are certainly an excellent option if you don’t want to invest the additional cash, and it is arguable that they are a bit more durable than the gas airsoft rifles. Also, if best airsoft sniper would like a semi automatic airsoft gun, then spring airsoft sniper rifles aren’t for you, as they are single shot only.