Is this right, springer & gas ram?

Pretty much, yes. By gas ram, it means an actual gas or air filled ram. They basically work just like the pistons on a car hood or rear hatch that when you open either, the pistons assist in lifting them. In the case of the Hatsan ram, it's filled with regular air, Crosman's are filled with nitrogen. The one in the picture below is from a Hatsan Edge Vortex gas rammed rifle laid out exactly as they came out of the receiver.

Piston to the left, gas ram, end cap that holds it all in. When you cock the rifle, the piston compresses that silver piston arm on the gas ram instead of a spring. When you pull the trigger that arm is now released and shoves the piston forward. Also where the difference in how they fire comes into play.

That gas ram just goes straight back and forth where a spring uncoiling tends to twist and turn and why you see many shooters saying they either tune or have someone tune a spring piston rifle for them. With a well fitted spring guide, top hat and proper lubing, that twisting and turning can be minimized to make for smoother shooting. You can also tune a gas rammed rifle, just no spring to deal with and even those can benefit from a good debur, polish and lube.

Hope this helps explain things a little.

 

Pretty much, yes. By gas ram, it means an actual gas or air filled ram. They basically work just like the pistons on a car hood or rear hatch that when you open either, the pistons assist in lifting them. In the case of the Hatsan ram, it's filled with regular air, Crosman's are filled with nitrogen. The one in the picture below is from a Hatsan Edge Vortex gas rammed rifle laid out exactly as they came out of the receiver.

Piston to the left, gas ram, end cap that holds it all in. When you cock the rifle, the piston compresses that silver piston arm on the gas ram instead of a spring. When you pull the trigger that arm is now released and shoves the piston forward. Also where the difference in how they fire comes into play.

That gas ram just goes straight back and forth where a spring uncoiling tends to twist and turn and why you see many shooters saying they either tune or have someone tune a spring piston rifle for them. With a well fitted spring guide, top hat and proper lubing, that twisting and turning can be minimized to make for smoother shooting. You can also tune a gas rammed rifle, just no spring to deal with and even those can benefit from a good debur, polish and lube.

Hope this helps explain things a little.

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+1

Gas rams do not actually have 2 pistons, some springers did and it's known as a Giss system. They are dual opposing pistons to cancel recoil and usually on 10m target rifles although Whiscombe used the same system on rifles and were much more potent than any 10m gun.