VSR M145 power spring, giving enough grunt to please most snipers. This is not for 45 degree piston/trigger sets.

External Diameter 13mm (approximately), Internal Diameter 10mm (approximately)

These generally require a level of technical skill to fit properly so we do advise you have it fitted by a competent technician.

Any questions on compatibility, installation or if you would like one of our in house techs to fit the parts for you, please email us on [email protected] or call us on 01293 525880