Geissele 16″ Super Modular Rail MK18 M-LOK

Geissele 16.5″ Super Modular Rail MK18 M-LOK

The Geissele Super Modular Rail MK18 is a slim free-float M-LOK hand guard for mil-spec AR-15 rifles, based on the MK16 but built to mount directly to Arca-Swiss quick-release bases. The flat underside is a 35 mm wide Arca-style form with a 45-degree dovetail, so the rifle slides into an Arca-Swiss quick-release mounting base at any point along the rail. Its small diameter and low height give a slim profile for competition shooters.

It uses Geissele’s proprietary 57 mm (2.25 in) long barrel nut, which gives a long, straight interface with the upper receiver along the whole free-float length.

• 35 mm Arca-Swiss style flat base with 45-degree dovetail along the bottom
• M-LOK slots on the left, right and bottom quadrants plus the upper 45-degree positions
• Proprietary 2.25 in Geissele barrel nut
• Slim profile: lower overall height than the MK16
• 7000-series aluminium, Type 3 hardcoat anodised

Designed for mil-spec M4/AR-15 upper receivers; compatibility with billet receivers is not confirmed by the maker. A Geissele barrel nut wrench is needed to install the rail (sold separately). Installation by a gunsmith is recommended. Available in Black and DDC. DDC = Geissele Desert Dirt Color.

Specifications:

• Length: 419 mm (16.5 in)
• Weight: 612 g (21.6 oz); 655 g (23.1 oz) with barrel nut
• Height: 52.8 mm (2.08 in)
• Inner diameter: 32.0 mm (1.26 in)
• Outer diameter (across quadrants): 40.4 mm (1.59 in)
• Material: 7000-series aluminium
• Finish: Type 3 hardcoat anodise
• Colours: Black, DDC
• Geissele part number: 05-791