• AAP-01 Short stroke kit, including a Hadron Designs specific 300% upgraded spring.
  • The short stroke segment, is made from a bouncy material, effectively taking the impact of the bolt, and bouncing it back. Hence why we nickname this kit, the "Bouncer".
  • This material property lessens the shock to the rear sight assembly.
  • Please note: kit no longer includes small black inner tube, this part is optional and is not required to use strengthened return spring.
  • As used by numerous YouTube Airsofters across the globe. Install, and welcome to the BRRRTTT.