Dirty Bird AR-15 SMRS Handguard - Slim M-LOK Rail System

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The SMRS (Slim M-LOK Rail System) by Dirty Bird Industries is a high quality and feature packed M-LOK hanguard designed for AR15 platform rifles and pistols. When designing this handguard, the team started from a basic set of requirements: The handguard must be tough, versatile, practical and have a straight forward install. 


  • Machined from aircraft grade 6061-T6 aluminum extrusions.
  • Anti-rotation tabs.
  • Type 3 hard anodizing or Cerakote™ sprayed at 1 mil thickness per spec.


  • M-LOK attachment slots on all sides (except top)
  • 1913 Picatinny top rail with shaved and beveled center section.
  • Raised QD attachment points at the 3 and 9 o'clock positions.
  • Snag free design with smooth, uniform octagonal surface ideal for accessory attachment or application of specialty coatings or patterns.


  • No extraneous cuts in the aluminum simply for the sake of weight savings or enhanced visual appearance.
  • Aircraft Grade aluminum barrel nut. In our tests, the aluminum barrel nuts are just as effective when torqued to spec. Additionally, the weight savings enable us to utilize a longer barrel nut design which means more surface area at the attachment point without adding unnecessary weight.
  • Compatible with most known low profile gas blocks.

Straight Forward Installation

  • No frills clamp-on style installation using only a 1-3/16 Crow's Foot wrench and 5/32" Allen key
  • Barrel nut does not requiring timing with the gas tube. No shims required.

The end result is a great looking, zero compromise handguard suitable for a wide variety of builds.  

Made in the USA

Dirty Bird Industries' Limited Lifetime Warranty 

Available Colors

Black, Magpul™ FDE, Magpul™ OD Green, Midnight Bronze

Interior Diameter

1.35" ID

1.7" Maximum Vertical ID (for considering vertical height of gas blocks)

Weight (including mounting hardware)

9.5" - 9oz 

13.5" - 11.4oz

15" - 12.4oz

Extra Information