Dirty Bird AR-15 SMRS Handguard – Slim M-LOK Rail System
The SMRS (Slim M-LOK Rail System) by Dirty Bird Industries is a high quality and feature packed M-LOK hanguard designed for AR-15 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.
NEW: This version features new patent pending anti-slip / anti-lift attachment method (ASALTM) for an easy, timing-free installation that provides an extremely rigid and secure attachment. Read below for more technical details about this impressive new attachment method.
Tough
- Machined from aircraft grade 6061-T6 aluminum extrusions.
- Anti-rotation tabs.
- Type 3 hard anodizing or Cerakote™ sprayed at 1 mil thickness per spec.
Versatile
- 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.
Practical
- 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, Sniper Grey
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
ASAL Attachement System Report
Eliminating Handguard Slip
The shockwave generated when firing an AR-15 creates over 1000 G’s of acceleration. This means that a one pound part will generate over 1000 pounds of force every time the rifle is fired. Combined with the thermal cycling generated when firing multiple rounds, it can be very difficult to keep a handguard from slipping forward or rotating. Many attempts have been made to solve this problem. Some solutions are overly complex, resulting in difficult installation and high manufacturing cost. Some designs, like the popular key seat, are overly simple. The key seat will stop a handguard from coming completely off of the rifle; however, it still allows some forward slip and 360 degrees of rotation.
Handguard Lift
Free-floating handguard mounting systems tend to produce an upward lift of the handguard, resulting in the muzzle end of the handguard floating higher than the receiver end. This lift can adversely affect the performance of the rifle, especially when using iron sights. Even if the handguard is only used for protecting your hand, a small amount of lift is noticeable when aiming down the sightline. This visually makes the rifle seem crooked. Even if the rifle performs with precision, it can create an optical illusion, thereby reducing accuracy.
Solution
The patent pending ASALTM (Anti-Slip / Anti-Lift) system is simple, easy to install, easy to manufacture, and a cost effective solution to handguard slip and lift issues. The ASALTM system locks the handguard to the barrel nut using a CamLokTM fastener featuring a 10 degree taper angle. This small taper creates a huge mechanical advantage, greatly increasing the force generated by a standard screw. The mating groove in the barrel nut is offset so as it is tightened, the handguard is pressed against the upper. This mitigates lift while also preventing slipping or rotation around the barrel’s axis. The result is a handguard that will not slip, rotate, or lift.
The result is a 10x decreases of handguard muzzle end lift.
Weight | 0.0000 oz |
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Dimensions | N/A |
Color | Black, FDE, Midnight Bronze, OD Green, Sniper Grey |
Length | 9.5", 13.5", 15" |
Compliance
NFA (National Firearms Act) compliance is crucial for legal ownership and transfer of regulated firearms and accessories like short-barreled rifles, suppressors, and certain types of ammunition, ensuring adherence to federal regulations to avoid legal penalties and ensure responsible firearm ownership.
Customer Reviews
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Dirty Bird
This was my first Dirty Bird purchase. I absolutely love this handguard. Craftsmanship is A+. Installation of barrel nut was simplified by not having to align any screws or holes. Handguard was a snug fit to my Anderson upper. Midnight Bronze looks fantastic with the black upper and lower, stainless fluted barrel. Added a few blue accents with the charging handle and magazine release. Handguard, also is functionally sound. Will most definitely buy again and will try other Dirty Bird products as well. And, as always, AR15DISCOUNTS, super fast in shipping and excellent customer service. I will be back for more...
Dirty bird 15” handguard
This is a great hand guard. The fit and finish is fantastic. Another great thing about this dirty bird hand guard is that they send detailed instructions. The instructions stated that I might need to file down the dust cover hinge pin... and I did. Once I filed it down it fit perfect. It also comes with a stamped steel wrench for the Barrel nut! AWESOME. I just put it on my torque wrench and boom... I was able to torque the barrel nut perfectly. The handguard was a little Over $100, but I believe it is well worth the price. 5 stars!
Great Handguard for the money!!
I was looking for a good looking, lightweight handguard for a new build I was working on and thought this looked good for the money. On receipt I was really impressed with the quality and workmanship. Installation was quick and easy and looks great! Will likely buy again for my next build.
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