Geissele Automatics MK16 Super Modular Rail M-LOK – 13.5″


DDC (Desert Dirt Color)

Product Description

The Super Modular Rail 13.5″ (SMR) MK16 M-LOK®, NSN# 1005-01-672-4794 (13.5”), has been adopted by USASOC for the URG-I program (Upper Receiver Group Improved).

The Geissele Super Modular Rail MK16 offers unmatched performance for the most demanding shooters. Mounted to your AR-15 upper using the updated version of the proven Geissele Barrel Nut design, the MK16 is not only easy to install and maintain, but offers superior rigidity. Anti-rotation tabs and set-screws ensure that your rail will won’t rotate, even under the most extreme conditions of use. M1913 picatinny rail on top and M-LOK™ slots on every quadrant ensures maximum customization for all your accessories. The Geissele SMR MK16 is precision machined using 6061-T6 Aluminum due to its strong, rigid and light properties, and is finished in durable Type-3 Hardcoat anodized.

  • HEIGHT: 2.39″
  • COLOR: Black or DDC
  • MATERIAL: 6061-T6
  • FINISH: Type 3 Hardcoast Anodize
  • AVAILABLE LENGTHS: 9.3″, 10.5″, 13.5″
  • OUTER DIAMETER (DAQ*): 1.59″
  • SMR MK16 13.5″ WEIGHT: 13.4oz (14.9oz w/ barrel nut)




Technical Information

Color / Pattern ,
Firearm Compatibility ,
Mounting Platform
Size 13.5"

Catalog Location

California Prop 65 Warning

WARNING: This product can expose you to chemicals, which are known to the State of California to cause Cancer and Reproductive Harm. For more information visit

Customer Reviews

Based on 6 reviews
Allen S.
Mk16 Review

Quality product from start to installation

Jordan T.

This is my second block 3 build my first was a 11.5 with a mk16 10 inch I decided to try the 14.5 with the 13.5 mk16 and could not be happier it bolts on solid and has anti rotation tabs so if you mount a peq or something like it it can not lose it’s zero it’s way lighter than I thought it would be I really can’t tell any difference between my mk16 and bcm recce in weight it’s without a doubt my favorite geissele rail my only complaint is the built in qd sling mount is on the top of the rail around the 10 and 2 clock so it’s pretty much useless if you try to mount a vickers or magpul sling with qd it will only attach sideways so your sling will twist or not up which is a huge problem for me maybe not for others so I run a magpul sling mount on the end of the rail I would to see geissele move to the 3 and 9 o’clock and put 2 more qd sling mounts on the front like Midwest industries but not a huge dealbreaker for me and I’m sure geissele is going to keep making changes


Great rail and an even better seller. Milspec Retail went out of their way and above and beyond to make sure I got the right rail for my build. Fast, free shipping, too!

Alex A.
Best Geissele rail to date

Awesome rail and awesome customer service from milspec retail. Super fast shipping. Was worried about it not fitting the vltor mur upper but it fits perfectly!

Carlos G.

Geissele Automatics MK16 Super Modular Rail M-LOK – 13.5″