Geissele Automatics 10" Super Modular Rail MK4 M-LOK (Federal) Handguard - P/N 05-430
The Geissele SMR MK4 M-LOK Federal is a 10" free-float AR-pattern handguard combining M-LOK mounting with integrated M1913 Picatinny rail sections at the fore in the 3, 6, and 9 o'clock positions, plus an elongated 6 o'clock Picatinny section for accessory clearance.
Constructed from 7000 series aluminum with a Type 3 hardcoat anodized finish, the MK4 is designed around mil-spec M4 upper receivers and provides a rigid, ventilated rail profile with M-LOK slots at the 3, 6, and 9 o'clock positions as well as the upper 45° quadrants.