Geissele 15" M-LOK MK16 Black Super Modular Rail 05-792B

Geissele 15" M-LOK MK16 Black Super Modular Rail 05-792B is about as much rail as the MK16 line offers - the pick for anyone running a longer barrel or a heavier accessory package who's found the 13.5" a little cramped.

Machined from 7000-series aluminum and Type III hardcoat anodized, this Geissele Super Modular Rail MK16 locks to the receiver through Geissele's torque-free clamping system, where anti-rotation tabs and set screws hold everything solid against recoil. That matters more here than on shorter rails, honestly - the longer the tube, the more leverage a loose mount has to work with, and a wobbly 15" rail will walk your zero off faster than a wobbly 10" one ever would. A full-length Picatinny rail runs the whole top, and M-LOK slots cover 3, 6, 9 o'clock plus the upper and lower 45° positions, so you're not stuck picking between light placement and grip placement.

Weight comes in around 15.6 ounces bare, 17.1 with the barrel nut - not nothing, but reasonable for what you're getting at this length. This MK16 Super Modular Rail is built for the shooters who'd rather have too much mounting real estate than not enough.

Key Features:

• 15" free-float length, full-length Picatinny top rail
• M-LOK slots at 3, 6, 9 o'clock plus upper/lower 45°
• 7000-series aluminum, Type III hardcoat anodized
• Anti-rotation tabs and set screws for torque-free rigidity
• Height 2.39", inner diameter 1.26", outer diameter 1.59"
• Weight: 15.6 oz bare, 17.1 oz w/ barrel nut
• Fits standard mil-spec AR-15 upper receivers
• Black finish

If the 13.5" felt like it was leaving accessory space on the table, Geissele MK16 15 is the fix.