Nitro piston is the latest technology in break barrel air rifles where the mechanical spring is replaced with a nitrogen gas filled unit. These rifles won’t lose velocity, will have quicker lock time and are quieter than the conventional spring rifles. The cocking effort is reduced as well as the jerk (recoil) compared to a springer is less. Combining the established features of the SX100 air rifles with the new S3 Nitro Spring technology make the NX100 series an ideal and reliable choice. Perfect for open sight target shooting competitions and open field shooting.