Standard T Slot Dimensions Metric
Posted : admin On 4/7/2022Dimensions of metric threads according ISO 724
The slot dimensions (used on handguards, etc.) are available on the web. The slots provide metric 20 mm (0.79 in) length intervals, and accessories can be mounted either within a slot or bridging between slots, making it possible to adjust the position of accessories in smaller intervals than the length of the slot. STANDARD SIZES Nominal Pin Length Length Tolerance Up to 24mm incl. ± 0.40mm Over 24mm to 50mm incl. ± 0.50mm Over 50mm to 75mm incl. ± 0.60mm Over 75mm ± 0.75mm Straightness Gauge Specifications3. Once you have selected one of our American Standard Parts, you just need to add your metric requirement in the RFQ. For example, for a Threaded Spacer, the metric requirement might be “M 3.5 x 0.6 Thread”. Below you’ll find details on conversions and dimensions that will help you order parts like metric screws and standoffs. Standard t nut sizes metric; T slot standard dimensions pdfThe symmetry requirement states that the centerplane of the key slot (blue, derived from slot walls) has to locate inside the given tolerance zone. In pursuit of headless set screws with a better drive than a straight slot. T-Slot Bolt Specifications - Metric. Product Class A DIN ISO 4759 Part 1; Hardness class 10.9 Bolt Size (d) T-Slot Size (a) L: Part. E: k: b: a1: Bolt Size (d) T.
ISO 724 specifies basic dimensions of metric threads in accordance with ISO 261. Dimensions refer to the basic profile in accordance with ISO 68.
There are three kinds of ISO metric threads:
- coarse
- fine
- extra fine
The thread angle is 60o. The thread depth is 0.614 x pitch.
Metric Threads - Coarse Thread Pitches
| Size - Nominal Diameter (mm) | Pitch1) (mm) | Clearance Drill (mm) | Tap Drill (mm) | Tensile Stress Area (mm2) |
|---|---|---|---|---|
| M 1.6 | 0.35 | 1.8 | 1.25 | |
| M 2 | 0.40 | 2.4 | 1.60 | |
| M 2.5 | 0.45 | 2.90 | 2.00 | |
| M 3 | 0.50 | 3.40 | 2.50 | |
| M 3.5 | 0.60 | 3.90 | 2.90 | |
| M 4 | 0.70 | 4.50 | 3.30 | 8.78 |
| M 5 | 0.80 | 5.50 | 4.20 | 14.2 |
| M 6 | 1.00 | 6.60 | 5.00 | 20.1 |
| M 8 | 1.25 | 9.00 | 6.80 | 36.6 |
| M 10 | 1.50 | 12.00 | 8.50 | 58.0 |
| M 12 | 1.75 | 14.00 | 10.20 | 84.3 |
| M 14 | 2.00 | 16.00 | 12.00 | |
| M 16 | 2.00 | 18.00 | 14.00 | 157 |
| M 20 | 2.50 | 22.00 | 17.50 | 245 |
| M 22 | 2.50 | 25.00 | 19.50 | |
| M 24 | 3.00 | 27.00 | 21.00 | 353 |
| M 27 | 3.00 | 30.00 | 24.00 | |
| M 30 | 3.50 | 33.00 | 26.50 | 561 |
| M 36 | 4.00 | 40.00 | 32.00 | 817 |
| M 42 | 4.50 | 46.00 | 37.50 | 1120 |
| M 48 | 5.00 | 53.00 | 43.00 | 1470 |
| M 56 | 5.50 | 62.00 | 50.50 | 2030 |
| M 64 | 6.00 | 70.00 | 58.00 | 2680 |
| M 68 | 6.00 | 74.00 | 62.00 |
Standard Key Slot Dimensions
1) For metric threads pitch is the distance between threads.
- 1 mm = 0.039 inches
Metric Threads - Fine Thread Pitches
It is common to designate metric fine threads with the capital M plus an indication to their nominal outer diameter and their pitch:
M size x pitch
Example:
M 10 x 1.5
| Size - Nominal Diameter (mm) | Pitch1) (mm) | Tap Drill (mm) | Tebsile Stress Area (mm2) |
|---|---|---|---|
| M 1.0 x 0.2 | 0.20 | 0.80 | |
| M 1.1 x 0.2 | 0.20 | 0.90 | |
| M 1.2 x 0.2 | 0.20 | 1.00 | |
| M 1.4 x 0.2 | 0.20 | 1.20 | |
| M 1.6 x 0.2 | 0.20 | 1.40 | |
| M 1.8 x 0.2 | 0.20 | 1.60 | |
| M 2 x 0.25 | 0.25 | 1.75 | |
| M 2.2 x 0.25 | 0.25 | 1.95 | |
| M 2.5 x 0.35 | 0.35 | 2.10 | |
| M 3 x 0.35 | 0.35 | 2.60 | |
| M 3.5 x 0.35 | 0.35 | 3.10 | |
| M 4 x 0.5 | 0.50 | 3.50 | |
| M 4.5 x 0.5 | 0.50 | 4.00 | |
| M 5 x 0.5 | 0.50 | 4.50 | |
| M 5.5 x 0.5 | 0.50 | 5.00 | |
| M 6 x 0.75 | 0.75 | 5.20 | 20.1 |
| M 7 x 0.75 | 0.75 | 6.20 | |
| M 8 x 0.75 | 0.75 | 7.20 | |
| M 8 x 1.0 | 1.00 | 7.00 | 39.2 |
| M 9 x 0.75 | 0.75 | 8.20 | |
| M 9 x 1 | 1.00 | 8.00 | |
| M 10 x 0.75 | 0.75 | 9.20 | |
| M 10 x 1 | 1.00 | 9.00 | 64.5 |
| M 10 x 1.25 | 1.25 | 8.80 | 61.2 |
| M 11 x 0.75 | 0.75 | 10.20 | |
| M 11 x 1 | 1.00 | 10.00 | |
| M 12 x 1 | 1.00 | 11.00 | |
| M 12 x 1.25 | 1.25 | 10.80 | 92.1 |
| M 12 x 1.5 | 1.50 | 10.50 | 88.1 |
| M 14 x 1.0 | 1.00 | 13.00 | |
| M 14 x 1.25 | 1.25 | 12.80 | |
| M 14 x 1.5 | 1.50 | 12.50 | |
| M 15 x 1 | 1.00 | 14.00 | |
| M 15 x 1.5 | 1.50 | 13.50 | |
| M 16 x 1 | 1.00 | 15.00 | 178 |
| M 16 x 1.5 | 1.50 | 14.50 | 167 |
| M 17 x 1.0 | 1.00 | 16.00 | |
| M 17 x 1.5 | 1.50 | 15.50 | |
| M 18 x 1.0 | 1.00 | 17.00 | |
| M 18 x 1.5 | 1.50 | 16.50 | |
| M 18 x 2.0 | 2.00 | 16.00 | |
| M 20 x 1.0 | 1.00 | 19.00 | |
| M 20 x 1.5 | 1.50 | 18.50 | 272 |
| M 20 x 2.0 | 2.00 | 18.00 | 258 |
| M 22 x 1.0 | 1.00 | 21.00 | |
| M 22 x 1.5 | 1.50 | 20.50 | |
| M 22 x 2.0 | 2.00 | 20.00 | |
| M 24 x 1.0 | 1.00 | 23.00 | |
| M 24 x 1.5 | 1.50 | 22.50 | 401 |
| M 24 x 2.0 | 2.00 | 22.00 | 384 |
| M 25 x 1.0 | 1.00 | 24.00 | |
| M 25 x 1.5 | 1.50 | 23.50 | |
| M 25 x 2.0 | 2.00 | 23.00 | |
| M 27 x 1.0 | 1.00 | 26.00 | |
| M 27 x 1.5 | 1.50 | 25.50 | |
| M 27 x 2.0 | 2.00 | 25.00 | |
| M 28 x 1.0 | 1.00 | 27.00 | |
| M 28 x 1.5 | 1.50 | 26.50 | |
| M 28 x 2.0 | 2.00 | 26.00 | |
| M 30 x 1.0 | 1.00 | 29.00 | |
| M 30 x 1.5 | 1.50 | 28.50 | |
| M 30 x 2.0 | 2.00 | 28.00 | 621 |
| M 30 x 3.0 | 3.00 | 27.00 | 581 |
| M 32 x 1.5 | 1.50 | 30.50 | |
| M 32 x 2.0 | 2.00 | 30.00 | |
| M 33 x 1.5 | 1.50 | 31.50 | |
| M 33 x 2.0 | 2.00 | 31.00 | |
| M 33 x 3.0 | 3.00 | 30.00 | |
| M 35 x 1.5 | 1.50 | 33.50 | |
| M 35 x 2.0 | 2.00 | 33.00 | |
| M 36 x 1.5 | 1.50 | 34.50 | |
| M 36 x 2.0 | 2.00 | 34.00 | 915 |
| M 36 x 3.0 | 3.00 | 33.00 | 865 |
| M 39 x 1.5 | 1.50 | 37.50 | |
| M 39 x 2.0 | 2.00 | 37.00 | |
| M 39 x 3.0 | 3.00 | 36.00 | |
| M 40 x 1.5 | 1.50 | 38.50 | |
| M 40 x 2.0 | 2.00 | 38.00 | |
| M 40 x 3.0 | 3.00 | 37.00 | |
| M 42 x 1.5 | 1.50 | 40.50 | |
| M 42 x 2.0 | 2.00 | 40.00 | |
| M 42 x 3.0 | 3.00 | 39.00 | 1210 |
| M 42 x 4.0 | 4.00 | 38.00 | 1150 |
| M 45 x 1.5 | 1.50 | 43.50 | |
| M 45 x 2.0 | 2.00 | 43.00 | |
| M 45 x 3.0 | 3.00 | 42.00 | |
| M 45 x 4.0 | 4.00 | 41.00 | |
| M 48 x 1.5 | 1.50 | 46.50 | |
| M 48 x 2.0 | 2.00 | 46.00 | |
| M 48 x 3.0 | 3.00 | 45.00 | 1600 |
| M 48 x 4.0 | 4.00 | 44.00 | 1540 |
| M 50 x 1.5 | 1.50 | 48.50 | |
| M 50 x 2.0 | 2.00 | 48.00 | |
| M 50 x 3.0 | 3.00 | 47.00 | |
| M 52 x 1.5 | 1.50 | 50.50 | |
| M 52 x 2.0 | 2.00 | 50.00 | |
| M 52 x 3.0 | 3.00 | 49.00 | |
| M 52 x 4.0 | 4.00 | 48.00 | |
| M 55 x 1.5 | 1.50 | 53.50 | |
| M 55 x 2.0 | 2.00 | 53.00 | |
| M 55 x 3.0 | 3.00 | 52.00 | |
| M 55 x 4.0 | 4.00 | 51.00 | |
| M 56 x 1.5 | 1.50 | 54.50 | |
| M 56 x 2.0 | 2.00 | 54.00 | |
| M 56 x 3.0 | 3.00 | 53.00 | |
| M 56 x 4.0 | 4.00 | 52.00 | |
| M 58 x 1.5 | 1.50 | 56.50 | |
| M 58 x 2.0 | 2.00 | 56.00 | |
| M 58 x 3.0 | 3.00 | 55.00 | |
| M 58 x 4.0 | 4.00 | 54.00 | |
| M 60 x 1.5 | 1.50 | 58.50 | |
| M 60 x 2.0 | 2.00 | 58.00 | |
| M 60 x 3.0 | 3.00 | 57.00 | |
| M 60 x 4.0 | 4.00 | 56.00 | |
| M 62 x 1.5 | 1.50 | 60.50 | |
| M 62 x 2.0 | 2.00 | 60.00 | |
| M 62 x 3.0 | 3.00 | 59.00 | |
| M 62 x 4.0 | 4.00 | 58.00 | |
| M 64 x 1.5 | 1.50 | 62.50 | |
| M 64 x 2.0 | 2.00 | 62.00 | |
| M 64 x 3.0 | 3.00 | 61.00 | |
| M 64 x 4.0 | 4.00 | 60.00 | |
| M 65 x 1.5 | 1.50 | 63.50 | |
| M 65 x 2.0 | 2.00 | 63.00 | |
| M 65 x 3.0 | 3.00 | 62.00 | |
| M 65 x 4.0 | 4.00 | 61.00 | |
| M 68 x 1.5 | 1.50 | 66.50 | |
| M 68 x 2.0 | 2.00 | 66.00 | |
| M 68 x 3.0 | 3.00 | 65.00 | |
| M 68 x 4.0 | 4.00 | 64.00 | |
| M 70 x 1.5 | 1.50 | 68.50 | |
| M 70 x 2.0 | 2.00 | 68.00 | |
| M 70 x 3.0 | 3.00 | 67.00 | |
| M 70 x 4.0 | 4.00 | 66.00 | |
| M 70 x 6.0 | 6.00 | 64.00 | |
| M 72 x 1.5 | 1.50 | 70.50 | |
| M 72 x 2.0 | 2.00 | 70.00 | |
| M 72 x 3.0 | 3.00 | 69.00 | |
| M 72 x 4.0 | 4.00 | 68.00 | |
| M 72 x 6.0 | 6.00 | 66.00 | |
| M 75 x 1.5 | 1.50 | 73.50 | |
| M 75 x 2.0 | 2.00 | 73.00 | |
| M 75 x 3.0 | 3.00 | 72.00 | |
| M 75 x 4.0 | 4.00 | 71.00 | |
| M 75 x 6.0 | 6.00 | 69.00 | |
| M 76 x 1.5 | 1.50 | 74.50 | |
| M 76 x 2.0 | 2.00 | 74.00 | |
| M 76 x 3.0 | 3.00 | 73.00 | |
| M 76 x 4.0 | 4.00 | 72.00 | |
| M 76 x 6.0 | 6.00 | 70.00 | |
| M 80 x 1.5 | 1.50 | 78.50 | |
| M 80 x 2.0 | 2.00 | 78.00 | |
| M 80 x 3.0 | 3.00 | 77.00 | |
| M 80 x 4.0 | 4.00 | 76.00 | |
| M 80 x 6.0 | 6.00 | 74.00 | |
| M 85 x 2.0 | 2.00 | 83.00 | |
| M 85 x 3.0 | 3.00 | 82.00 | |
| M 85 x 4.0 | 4.00 | 81.00 | |
| M 85 x 6.0 | 6.00 | 79.00 | |
| M 90 x 2.0 | 2.00 | 88.00 | |
| M 90 x 3.0 | 3.00 | 87.00 | |
| M 90 x 4.0 | 4.00 | 86.00 | |
| M 90 x 6.0 | 6.00 | 84.00 | |
| M 95 x 2.0 | 2.00 | 93.00 | |
| M 95 x 3.0 | 3.00 | 92.00 | |
| M 95 x 4.0 | 4.00 | 91.00 | |
| M 95 x 6.0 | 6.00 | 89.00 | |
| M 100 x 2.0 | 2.00 | 98.00 | |
| M 100 x 3.0 | 3.00 | 97.00 | |
| M 100 x 4.0 | 4.00 | 96.00 | |
| M 100 x 6.0 | 6.00 | 94.00 |
Related ISO Standards
- ISO 68:1973 ISO general purpose screw threads - Basic profile
- ISO 261:1973 ISO general purpose metric screw threads - General plan
- ISO 262:1973 ISO general purpose metric screw threads - Selected sizes for screws, bolts and nuts
- ISO 724:1993 ISO general-purpose metric screw threads - Basic dimensions
- ISO 965-1:1980 ISO general purpose metric screw threads - Tolerances - Part 1: Principles and basic data
- ISO 965-2:1980 ISO general purpose metric screw threads - Tolerances - Part 2: Limits of sizes for general purpose bolt and nut threads - Medium quality
- ISO 965-3:1980 ISO general purpose metric screw threads - Tolerances - Part 3: Deviations for constructional threads
- ISO 1502:1996 ISO general-purpose metric screw threads - Gauges and gauging
Threads produced to this standard are interchangeable with threads produced to the metric standard ANSI/ASME B1.13M Metric Screw Threads: M Profile.
T Slot Dimensions Standard
Related Topics
- Miscellaneous - Engineering related topics like Beaufort Wind Scale, CE-marking, drawing standards and more
- Threads - Thread data - metric, unified, ACME and others
Related Documents
- ANSI B1.20.1 - NPS - American National Standard Straight Pipe Threads - NPS pressure tight straight pipe threads with lubricant or sealer
- ANSI B1.20.1 - NPT - American National Standard Taper Pipe Threads - NPT and NPTF pipe threads - dimensions according ANSI/ASME B1.20.1/3
- ANSI/ASME B1.5 - ACME Screw Threads - Acme trapezoidal threads
- Bolt Stretching and Tensile Stress - Tensile stress and Hooke's Law
- BS 21 - Pressure Tight Pipe Thread Joints - BSPT - British Standard Pipe Taper threads & BSP or BSPF - British Standard Pipe Parallel (Straight) threads
- EN 10226 - Pipe threads where pressure tight joints are made on the threads - Dimensions - Pipe threads where pressure tight joints are made on the threads - Part 1: Taper external threads and parallel internal threads
- ISO - Pipe, Tube and Fittings Standards and Specifications - International Organization for Standardization - ISO - pipe, tube and fittings standards and specifications
- ISO 228 - Pipe Threads where Pressure-tight Joints are not made on the Threads - Requirements for thread form, dimensions, tolerances and designation for fastening pipe threads, thread sizes
- ISO 2841 - Spark Plugs Metric Threads - Metric threads spark plugs according ISO 28741
- ISO 2901 - Metric Trapezoidal Screw Threads - Dimensions of ISO metric trapezoidal screw threads
- ISO 7 - Pipe Threads where Pressure-tight Joints are made on the Threads - Pressure-tight joints made on the pipe threads
- Metric Bolt Head and Wrench Size - ANSI/SO, DIN and JIS bolts
- Metric Bolts - Minimum Ultimate Tensile and Proof Loads - Minimum ultimate tensile and proof loads for metric bolts with coarse or fine threads
- Metric Bolts - Tightening Torques - Typical maximum recommended thightening torques for metric bolts
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- US and Metric Fasteners - Thread Sizes - Printable fastener chart
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- Withworth Threads - Taps and Drill Sizes - Taps and drill sizes used for Whitworth - ISO 7 and ISO 228 threads
- Wrench Spanner - Inches to mm - SAE to metric wrench and spanner converter chart
| M-LOK | |
|---|---|
| Type | Attachment System |
| Place of origin | United States |
| Production history | |
| Designer | Magpul Industries |
| Designed | 2007–2014 |
| Produced | 2014–present |
M-LOK, standing for Modular Lock, is a free licensed[1]firearmrail interface system developed and patented by Magpul Industries.
M-LOK allows for direct accessory attachment onto the 'negative space' (hollow slot) mounting points, and is a competing standard to VLTOR's open sourcedKeyMod system for replacing the ubiquitous Picatinny rail in some applications.[2] Compared to the Picatinny rail system, both M-LOK and KeyMod enable the user to have a slimmer, lighter, smoother and more fenestratedhandguard/fore-end with accessories mounted only where needed, whereas a Picatinny handguards typically will have rail slots for its whole length resulting in a heavier and bulkier handguard with sharp edges and poorer barrel ventilation.
The M-LOK system can be seen as an evolution of the Magpul Original Equipment (MOE) system, but the two are not fully compatible. Though newer M-LOK accessories can be used on older MOE slot handguards if an adaptor plate is used, there is no adaptor available for using older MOE accessories on the newer M-LOK handguards.
History[edit]
A prototype of the MOE slot was revealed by Magpul in late 2007 together with their Masada Concept Rifle (which would later be known as the Adaptive Combat Rifle). The MOE slot system was released by Magpul in 2009 as a feature on their MOE handguards, and at the same time compatible accessories such as Picatinny rail sections, direct MOE mounted light mounts, grips, bipod studs, etc. were released.
The MOE slot standard was never officially released, and a drawback to the system was that the rear side of the panel had to be accessed in order to mount accessories, limiting its application. The MOE slot system uses a weld nut which has to be placed manually on the inside of the handguard before mounting, making the slot system unsuited for applications such as free-floating handguards. Also, depending on the accessory item, the spacing increments between the MOE slots were not small or uniform enough to adjust the desired placement of accessories.
Acknowledging shortcomings of the MOE systems, Magpul drafted M-LOK as a new and improved mounting standard which was released in 2014 replacing the existing MOE slot. The M-LOK rail specification included metric dimensions instead of imperial, and utilizes a T-slot nut capable of only 90-degree rotation, reinforced by thread-locking fluid, making it suited for applications on free-floating handguards. It was designed to work with both metal and polymer parts.
In 2016, Colt Canada developed and released the Modular Rail Rifle (MRR) that uses a monolithic upper receiver with the M-LOK attachment system.[3] In 2017, several companies produce M-LOK handguards as well as accessories like Picatinny rail strips, vertical foregrips, bipods, sling adaptors, and flashlight mounts.[4]
In 2017, a summary report of testing conducted by NSWC-Crane for USSOCOM indicated that, while comparable in endurance and rough handling testing, M-Lok greatly outperformed Keymod in repeatability, drop testing and failure load testing.[5]
Licensing[edit]
While M-LOK is free licensed, it is not open source, and thus manufacturers must acquire a license from Magpul before making products using the M-LOK standard. Magpul claims this gives them more control in assuring that all M-LOK products are made to specifications ensuring compatibility. Program participation is open to any interested manufacturer.
Technical specifications[edit]
Rail specifications[edit]
The slot dimensions (used on handguards, etc.) are available on the web.[6] The slots provide metric 20 mm (0.79 in) length intervals, and accessories can be mounted either within a slot or bridging between slots, making it possible to adjust the position of accessories in smaller intervals than the length of the slot. The slots on an M-Lok handguard are approximately 32 mm (1.260 in) long and 7 mm (0.276 in) wide and space 8 mm (0.315 in) from each other. The radius of the corners is approximately 2.38 mm (0.094 in).[7][8][9]
Attachment specifications[edit]
The quarter-turn T-slot nuts have different torque specifications depending on the handguard material:
- 4.0 N⋅m (35 lb⋅in) for attaching metal accessories to metal handguards.
- 1.7 N⋅m (15 lb⋅in) for attaching polymer or metal accessories to polymer handguards.
- 1.7 N⋅m (15 lb⋅in) for attaching polymer accessories to metal handguards.
Attachment screws made by many U.S. manufacturers are often either #8-32 TPI or 10-24 TPI UNC threads, which respectively have major thread diameters of 0.1640 inches and 0.1900 inches (4.166-0.794 mm and 4.826-1.058 mm expressed in metric designation). Many M-LOK screws on the international market instead use either M4 or M5 metric threads to reduce cost.
The tool required for mounting, in addition to the thread size, also depends the screw head type. Hex keys are used extensively in the firearms industry, but metric and imperial hex keys as a general rule are not compatible. It is possible damage the tool and screw by selecting a tool that is too small for the fastener, which can be done by using an Imperial/customary tool on a metric fastener, or the converse. An exception to this is 4 mm hex keys, which are almost the exact same size as 5⁄32 in (3.97 mm). In many industries, this makes 4.0 mm (5⁄32 in) hex keys preferred for consumer products because end users can successfully use an imperial key on a metric fastener, and vice versa.
| Hex key spanner (wrench) size | ||||
|---|---|---|---|---|
Thread type | Socket head cap screw | • Button head cap screw • Flat head counter- sunk cap screw | ||
| M4 | 3 mm | 2.5 mm | ||
| M5 | 4 mm | 3 mm | ||
| #8-32 TPI | 9/64' (3.57 mm) | 3/32' (2.38 mm) | ||
| #10-24 TPI | 5/32' (3.97 mm) | 1/8' (3.18 mm) | ||
While screw and slot dimensions are available on the web, the T-slot nut dimensions are currently under review by the US State Department to determine whether it should be regulated by ITAR, and until it is clarified drawings are only available to US citizens.
M-LOK handguard and attachment parts
M-LOK approximate slot dimensions. (Primary measurements in millimeters, inches in parenthesis).
See also[edit]
- Rail Integration System, generic term for a system for attaching accessories to small firearms
- Weaver rail mount, early system used for scope mounts, still has some popularity in the civilian market
- Picatinny rail (MIL-STD-1913), improved and standardized version of the Weaver mount. Used for both for scope mounts, and for accessories (such as extra sling mounts, vertical grips, bipods etc.) Major popularity in the civilian market.
- NATO Accessory Rail- further development from the MIL-STD-1913
- UIT rail, an older standard used for mounting slings particularly on competition firearms
- KeyMod - competing standard open standard design to M-LOK for mounting accessories
- Zeiss rail, a ringless scope mounting standard
References[edit]
| Wikimedia Commons has media related to M-LOK. |
- ^'Magpul Industries - M-LOK'. Archived from the original on 4 December 2017. Retrieved 6 June 2016.
- ^KeyMod vs. M-Lok: The Next AR Rail Standard by Chris Baker, November, 19, 2014
- ^Colt Canada Modular Rail Rifle (MRR)
- ^M-LOK Outselling KeyMod about 3 to 1, 28 January 2016
- ^Details On The USSOCOM Sponsored KeyMod vs M-LOK Test Conducted at NSWC-Crane, 5 May 2017
- ^Magpul Industries - M-LOK DESCRIPTION AND FAQ DOCUMENT[permanent dead link]
- ^'magpul.com - M-LOK 2015 FAQs'(PDF). Archived from the original(PDF) on 7 April 2019. Retrieved 7 April 2019.
- ^M-Lok dimensions
- ^Magpul M-LOK estimated dimensions