SR M-LOK Rail 12.5"

Now: $179.95
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(5 reviews) Write a Review

Griffin Armament® M-LOK compatible SR rails (Suppressor Ready) 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.

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 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.  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 rails.

Key points - price and inclusions:

  • MSRP from $179.95
  • Available Lengths 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 Rail
  • 7075, T-6, Type 3 hardcoat anodized, aluminum barrel nut

45 degree Picatinny QD swivel mount (pictured but not included)

Specs : 

  • Length: 12.5"
  • Height 2"
  • Internal Diameter 1.54" (measured from inside of reinforcement spars)
  • Width: 1.79"
  • Weight Installed: 10.9 ounces
Gas Block and Furniture Included?:
Type Of Part:


5 Reviews

  • 4
    Wish I would’ve known

    Published by Ben N on 27th Jan 2023

    This seems to be an excellent rail. Fit/finish is superb, it’s EXTREMELY rigid and will serve most very well. HOWEVER, if you plan on running a 1.5 diameter suppressor under the rail you WILL NOT be able to attach any mlok accessories due to the fact that the rail is so slim there’s not enough clearance between the inside of the rail and the suppressor to fit mlok nuts. Wish this was advertised in the description of the rail so I’ll be returning this. I have already ordered the 9.5 SR rail to use instead so that should show I believe this is a good product.

  • 5
    12.5 SR Rigid Rail

    Published by James Henderson on 23rd Jan 2023

    This rail is an excellent compliment to my 300 blk build as I went with a 10.5 in. barrel and wanted a little more reach than the 9.5 inch rail that I had already installed. The finish and the machining is top notch and it went together with ease. G.A. is cool enough to include a multipurpose barrel wrench, and my order processed and shipped super quick.

  • 5
    SR-Rigid M-lok Rail

    Published by Leland on 19th Dec 2022

    1st Customer Service was great! I ordered the wrong length and they swapped it out prior to shipping and even adjusted the price downward since the one I wanted was a few dollars cheaper. 2nd the rail is everything I was expecting and stiffer than the MidWest Industries rail I was running.

  • 5

    Published by Tom Barrett on 9th Nov 2022

    Product works PERFECT and has just enough I.D. for the GP5 to fit!

  • 5

    Published by Brandon on 10th May 2021

    Two words: light, legit