Geissele 13.5" M-LOK MK16 DDC Super Modular Rail 05-650S

Geissele 13.5" M-LOK MK16 DDC Super Modular Rail 05-650S sits right in the middle of the MK16 lineup — long enough to give a mid-length or rifle-length gas system full clearance and enough M-LOK real estate for a serious accessory load, without pushing into the weight and bulk of the full 15" option.

This Geissele Super Modular Rail MK16 is machined from 7000-series aircraft aluminum and locks to the upper receiver through Geissele's proprietary barrel nut, which extends contact with the receiver well beyond a standard nut's footprint. Anti-rotation tabs and set screws reinforce that connection, so the rail holds its position under recoil instead of walking a mounted light or optic off zero over time. A full-length M1913 Picatinny top rail runs the entire 13.5" span for uninterrupted optic mounting, while M-LOK slots across every quadrant give builders flexibility on where lights, grips, and slings actually sit.

Finished in Geissele's Desert Dirt Color anodized coating, this 13.5 MLOK handguard stays lightweight without giving up the rigidity that separates a genuine Geissele rail from a standard aftermarket free-float tube. The same length is also offered in black for builds that don't call for a coordinated earth-tone profile.

Key Features:

• 13.5" free-float length, full-length Picatinny top rail
• M-LOK attachment slots across every quadrant
• 7000-series aircraft aluminum construction
• Desert Dirt Color (DDC) anodized finish
• Proprietary Geissele barrel nut for extended receiver contact
• Anti-rotation tabs and set screws prevent rail rotation
• Lightweight design without reduced rigidity
• Fits standard mil-spec AR-15 upper receivers

This Geissele 13.5 rail delivers the same URG-I-proven rigidity as Geissele's shorter and longer options, finished for builds that call for a low-visibility earth-tone profile- reference Geissele MK16 13.5 DDC or part number 05-650S for ordering.