Geissele 13.5" M-LOK MK8 Black Super Modular Rail 05-285B

Geissele 13.5" M-LOK MK8 Black Super Modular Rail 05-285B was one of the first Geissele rails built around M-LOK back when that mounting standard was still new, stretched here to a length that gives a mid-length or rifle-length gas system full clearance.

Machined from 7000-series aluminum and Type III hardcoat anodized, this Geissele Super Modular Rail MK8 locks to the receiver with Geissele's proprietary 2.25" barrel nut - longer than a standard nut, which means more surface contact and a rail that stays straight and true even after you've pulled it off for maintenance and put it back on. M-LOK Rail slots sit at 3, 6, and 9 o'clock plus the upper 45° quadrants, so you're not stuck picking between light placement and grip placement.

The lower 45° quadrants are vented pretty heavily, which cuts weight and helps a hot barrel shed heat faster. This 13.5" Handguard comes in around 10.8 ounces bare, 13.1 with the barrel nut installed - light for a rail this length, without feeling thin in hand.

Key Features:

• 13.5" free-float length, full-length Picatinny top rail
• M-LOK slots at 3, 6, 9 o'clock plus upper 45° quadrants
• 7000-series aluminum, Type III hardcoat anodized
• Proprietary 2.25" Geissele barrel nut
• Weight: 10.8 oz bare, 13.1 oz w/ barrel nut
• Black finish
• Fits mil-spec AR-15 upper receivers
• Anti-rotation tabs and set screws for torque-free rigidity

This 13.5 inch Free Float Handguard earned its reputation early and just kept delivering - a solid pick for a mid-length or rifle-length build that needs real M-LOK real estate. Reference this Geissele SMR Rail, or the broader Geissele Rail lineup, or part number 05-285B when ordering.