Geissele Super Modular Rail MK4 Federal M-LOK 10" AR-15

The Geissele MK4 Federal Super Modular Rail is a 10 in free-float AR-15 handguard with a full-length top Picatinny rail, an extended rail at 6 o'clock and short rails at 3 and 9 o'clock, plus M-LOK slots. Geissele says the same rail is used on FBI contract rifles.

Features

• Full-length M1913 Picatinny rail at 12 o'clock
• Extended Picatinny rail at 6 o'clock
• Short Picatinny rails at 3 and 9 o'clock
• M-LOK slots at 3 and 9 o'clock and in the upper 45 degree quadrants
• Large vent openings reduce weight and help dissipate heat

Specifications

• Material: 6061-T6 aluminum
• Finish: Type 3 hardcoat anodize, black
• Length: 10"
• Inner diameter: 1.35"
• Outer diameter: 2.11"
• Weight: 10.2 oz (11.8 oz with barrel nut)

Fits

• Mil-spec AR-15 / M4 upper receivers
• Geissele barrel nut wrench required (sold separately)

In the box

• MK4 Federal rail
• Geissele MK4-8 style barrel nut
• Gas block and barrel nut wrench not included