345 FPS with

This is what Hi-Capa is all about-- 43 airsoft BBs ready to go in a single magazine

(without packaging)

includes a Remote Pressure Switch

KM4 SR Free Float Rail Base Ring Assembly (Part 537S) Mechbox Pro 345 FPS withThe SR free float rail base ring assembly contains everything you need to attach the KWA SR rails to your KM4 AEG. In this brand new package, you can customize your KM4 to fit your own style of play, whether its with the SR7, SR10, or SR12 free float rails (sold separately). Pick up a kit at this special price while they last! Contents: 1x Free Float Rail Base, Part 537 1x Free Float Rail Barrel Ring, Part 538 1x Free Float Rail Knurled Handguard