KM4 SR Free Float Rail Base Ring Assembly (Part 537S) Retro Arms while the front webbing offers

while the front webbing offers additional space for attachments

Precision built motor housing

Metal loop will accommodate 1

SCREW IS INCLUDED

Size: M - XL Adjustable

KM4 SR Free Float Rail Base Ring Assembly (Part 537S) Retro Arms while the front webbing offersThe 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