Pneumatic gun length

[twbta]

I was wondering how the pneumatic guns are measured. Say it was a 70 cm gun. Is this the stroke of the piston, full length of the gun, or something else?

Thank you for your time

[Amphibian]

Well, my mares cyrano 970 (97cm) is exactly 97cm from the muzzle to the charging valve cover at the rear, so basically the length of the whole unloaded gun if you ignore the few cm of handle rewards.

As a rubber gun is measured from the muzzle to the notch on shaft this means that a 100cm rubber gun is actually about 20-30cm longer than a 100cm pneumatic! my sporasub sniper '100cm' is 150cm with spear!