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  1. P

    Air Arms Please I need help with Air Arms S400 power

    Yay found the problem. The oring between the bolt carrier and valve body was squashing into and restricting the port. This happened even on countless disassembles and reassemblies. I took the barrel out to look down the grub screws hole to see what was going on. Eventually made my own washer out...
  2. P

    Air Arms Please I need help with Air Arms S400 power

    The restrictor is screwed out so the tip just doesn't protrude into the port. The barrel is clean and aligned.
  3. P

    Air Arms Please I need help with Air Arms S400 power

    Hi everyone. I have an air arms s400 .177 that's maybe 15 years old but only shot maybe 10 tins of ammo through it. It was unused for many years and now that I've taken it out to shoot again, the power is very low. It's shooting 570fps with .5g pellets which is 5ftlb back in the day it was...