Tuning AA 510 TC in .25 bolt o-ring size

[prfleetsvs]

Have a .25 cal Air Arms 510TC and have to change the bolt 0-ring, the one which fits in the groove inside the breech end of the barrel.

Believe the AA part # is FP122. If you know size and hardness, appreciate the info.

Thanks,

Pedro in PR

 

[BSJ]

Awesome site for AA parts info! airarmsspares.com - Air Arms Spares

 

[prfleetsvs]

Thanks, good info.