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.