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Griffin Armament® M-LOK compatible SR-RIGID™ rails (Suppressor Ready - Rigid) allow up to 1.5” outside diameter silencers to be mounted inside the octagonal M-LOK rail. This provides suppressor aficionados a sleek, and compact overall length to AR15 type firearms.

Design objectives of this rail were to provide a suppressor compatible rail, with increased rigidity and durability over similar weight and profile current market options. A custom extrusion provides significant internal reinforcements to reduce flex when loading the carbine on the rail.

Evan Green, Business Manager at Griffin Armament states,
“We understand the importance of low light targeting with IR lasers and other low light targeting systems.  Reducing flex with our ID reinforcement spars reduces POI shift related to rail mounted lasers and night vision clip-ons. These rails offer more accuracy (less flex) than their competition which means more lethality under hours of darkness.”

These reinforcements provide rigid mounting for IR laser aimers ensuring minimal POI shift when torque is applied to fore-grip type accessories, or when loads are applied to the rail such as practical shooting off barricades or when loading bipods for rapid follow up shots. Internal practical testing showed substantial reductions in POI shift with laser aimers versus competing "slim rails" that lacked this notable product feature.

The new SR-RIGID™ rails features a close tolerance, heavy-duty, 7075 aluminum, T-6, type 3 hard coat anodized finish. The barrel nut can be easily installed to 35-85 ft/lbs using the included Griffin Armorers Wrench.  The new slip fit clamp design is extremely user friendly and does not require any shims or special timing methods. The clamp geometry in the rear section of the rail is low profile and ergonomically pleasing even for long durations of extended carry at static security positions. Flat head T15 torx screws should be tightened to 25/in pounds. The included 45 degree picatinny QD sling swivel can be installed on the top picatinny rail to the desired position of the end user.  M-LOK flats on each 45 degree surface allow for mounting of your favorite M-LOK accessories. A contiguous picatinny top rail ensures repeatable and accurate mounting for night vision and thermal systems.
If you are looking for a high quality, feature rich, American made rail system for your AR15 type firearm look no further than Griffin Armament®  SR-RIGID™ rails.


To find out more on Griffin Armament’s entire product line, please visit their website at www.GriffinArmament.com.


Key points - price and inclusions:

• MSRP from $169.95

• Available Lengths 15”, 13.5”, 12.5”, 11.5”, 10.5”, 9.5”, 7.5”

• 7 sides of M-LOK interfaces

• Contiguous 1913 Picatinny top rail

• Low profile, user friendly, clamp installation design

• Multi-Function Griffin Armorers wrench included

• 6061-T6, Type 3 hardcoat anodized SR-Rigid™ Rail

• 7075, T-6, Type 3 hardcoat anodized, aluminum barrel nut

• 45 degree Picatinny QD swivel mount included

You can reach out to our customer service at [email protected] to see if they have one.

Just added the SR-RIGID™ Installation Guide to the original post!

If you'd like to hear Austin and Evan discuss the SR-RIGID™ rails further, check out the most recent "Dwell Time" podcast titled "SR-RIGID™ a Free Float, Suppressor Ready Rail System".  

Our podcast can be found on our website or any podcast streaming platform!

What is the internal diameter?

Internal Diameter is 1.54" (measured from inside of reinforcement spars).

That's not correct.  I just measured one at 1.59" ID on the ribs.  The ribs  on the rail I was holding were lower than the flats by .005 a side  The design dimension was 1.600" There is a decent amount of room for 1.530" and smaller cans to float.  

Yes.  That was intended for our silencers which are 1.53" and smaller diameter for the most part, granted there is some additional clearance.