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m-lok

M-LOK, for Modular Lock, is a free licensed firearm rail 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 sourced KeyMod system for replacing the ubiquitous Picatinny rail in some applications. Compared to the Picatinny rail system, both M-LOK and KeyMod enable the user to have a slimmer, lighter, smoother and more fenestrated handguard/fore-end with accessories mounted only where needed, whereas a Picatinny handguard 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.

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Recent contents
  1. tmanhawk

    Handguard 10-10.5

      1. Want to Buy
      2. Want to Trade For
    • Vancouver
    • Washington
    Looking for relatively inexpensive handguard that is 10"-10.5" in length. M-Lok Free float Hardware included Palmetto state armory preferred (it’s a plinking toy) Trades I have + cash Rainer arms brake .224 cal 223/556 VG6 epsilon 223/556 VG6 cage for blast mitigation (makes a massive...
  2. Tacompton173

    SALE PENDING Aero Precision, Ballistic Advantage Hansen, Mega 16" 223 Wylde Complete Upper w BCG CH

      1. For Sale
      2. For Trade
    • $580
    • Sumner
    • Washington
    Used for less than 100 rounds. Shoots awesome. I'm selling it because I never shoot it. Barrel is guaranteed sub-MOA by Ballistic Advantage (with match ammo). No lower. Photo is for demonstration purposes only. Specs: Aero Precision M4E1 Upper Receiver, Anodized Aero Precision 15" ATLAS S-ONE...
  3. Dalshakkamel

    BCM complete 14.5” upper

      1. For Sale
    • $600
    • Gresham
    • Oregon
    This was on my backup gun but that was replaced with a galil and I found something I want. It’s a factory made upper aside from the centurion m-lok hand guard I installed. Everything was torqued down to spec and blue locktight was used where recommended. This is a socom profile barrel...
  4. thdpdx

    Magpul, B5 Systems, BCM Gunfighter, AR Grips, Stocks & M-LOK, etc.

      1. For Sale
    • $140
    • Beaverton
    • Oregon
    I've ended up with several like new (or new) AR parts and would like to offer them as a last minute holiday bundle 🎄 $300 worth of of parts all in original packaging. Asking $140. • Aero Precision Mil-Spec Carbine Length Buffer & Spring (New) • B5 Systems SOPMOD Bravo Stock in - ODG (New) •...
  5. Roymil666

    Aero R-one handguard

      1. For Sale
    • $115
    • AURORA
    • Oregon
    I've got a bnib Aero Precision R-one 10.3" handguard in Kodiak Brown taking up space on my bench. Picked this up recently but have no use for it right now. Asking $115.
  6. jgraphix73

    1x upper for sale | Never fired | PSA 10.5" 1/7 M-Lok, comes with BCG and CH

      1. For Sale
      2. For Trade
    • $260
    • Happy Valley
    • Oregon
    UPDATE: 1x upper for sale as one has been sold. Up for sale is an unfired and new upper from PSA. I bought them as a kit a year ago for some projects, which I abandoned and decided to go in another direction. Have been inside my safe and never fired. Clean and new (I can take more photos if you...
  7. B

    Remington 700 6.5 Creedmoor Long Range Target Rifle, Vortex Scope, and Extras Package

      1. For Sale
    • $3100
    • Hood River
    • Oregon
    Remington 700 6.5 Creedmoor bolt-action, magazine fed, long range target rifle, with Vortex Scope, and extras for sale. Rifle was built by JTS Precision LLC in Hood River, Oregon. It has a 26-inch heavy barrel, an Area 419 Hellfire self timing muzzle brake, a Timney Trigger set at 5.5 ounces...
  8. DRAGO71

    Heckler & Koch MR556 & HK MR556 A1 – 12.5″ M-LOK Handguard / Rail

      1. For Sale
    • $150
    • Danascus
    • Oregon
    Made by HK and manufactured from aircraft grade aluminum with a black hard coat anodized finish, this M-LOK handguard is for the Heckler & Koch MR556 & HK 416 rifles chambered in 5.56x45mm and .223 Rem. This handguard showcases a 12.5″ length and includes a picatinny rail and utilizes M-LOK...
  9. N

    AR-15: Springfield Saint Victor .556 16” M-lok & magpul pmags

      1. For Sale
    • $800
    • Portland
    • Oregon
    Rifle is like-new, has about 200 rounds through it. Sale includes: - 6 30-round pmags - 120 rounds of ammo - magpul pro offset iron sights
  10. Z

    PSA 10.5" 5.56 LIGHTWEIGHT UPPER

      1. For Sale
    • $300
    • Bellevue
    • Washington
    I want to upgrade to another upper so selling my PSA complete upper now. PSA link, https://palmettostatearmory.com/psa-10-5-5-56-lightweight-m-lok-slant-12-upper-with-mbus-sight-set-bcg-ch-fluted-flash-can-516447012.html Round count: 300-450ish and only shot in range. The flip sights were...
  11. Aero Denezol

    Question about free float AR uppers * free float newb

    I recently purchased a very nice Aero Precision 14.5" upper with an m-lok handguard. I took the day off and was excited for to put together a new build. My plan was to change out the m-lok handguard for a Midwest Industries handguard, but then I ran into this (see photo). This is part of the...
  12. wsu 5.9er

    AR15 Complete upper, 10.5" 556 w/MLOK rail

      1. For Sale
    • $325
    • Auburn
    • Washington
    Complete AR15 upper receiver from Larsen Outfitters. Has a 10.5" barrel, chambered in 556 NATO, with a 10" Free float rail with Magpul M-LOK quick attach system. 9310 bolt group, A2 flash hider and 7075 T6 charging handle. Complete, ready to drop on your pistol AR or SBR! All new, never fired...
  13. dbg19

    9.3" Atlas R-One M-LOK Handguard

      1. For Sale
      2. For Trade
    • $100
    • GRESHAM
    • Oregon
    SOLD PENDING FUNDS Atlas R-One M-LOK Handguard by Aero Precision Branded Ballistic Advantage Length: 9.3" Weight: 6.03 oz Mounting Hardware Weight: 1.90 oz Full top picatinny rail for optional attachments Quick disconnect sling socket at the 3, 6 and 9 o'clock positions Compatible with low...
  14. tlundlund15

    WTT/WTS Aero Atlas S-one handguard

      1. For Sale
      2. For Trade
    • Vancouver
    • Washington
    Hey y’all. Looking to sell or trade my Aero Atlas S-One handguard for a R-one, or a handguard that is similar. I mounted this last summer and have only shot it once, sighting in a scope. I prefer the full length top rail, let me know what y’all have and/or send me an offer!
  15. tlundlund15

    Aero m5 complete upper

      1. For Sale
      2. For Trade
    • $649
    • Vancouver
    • Washington
    Looking to part ways with JUST THE UPPER of my Aero .308 M5, because I want to go a different route, shorter and a NiB bolt. Most of this upper is Aero- the receiver is the M5 receiver, the handguard is a 15” aero atlas m-lok, gas block, & the BCG are both aero as well. The barrel is an 18”...
  16. Daredevil27

    Midwest Industries G4 MLOK 13.375" Handguard

      1. For Sale
    • $140
    • Bellevue
    • Washington
    Great condition, used for one range trip and decided on longer rail. Comes with all you see. Two small knicks on right side. Arrived that way, but overall great condition. $140 shipped.
  17. T

    Noveske nhr m-lok handguard (9.15”)

      1. For Sale
    • $200
    • Albany
    • Oregon
    No package but never used. Website says $305. Asking $200 or best offer. Comes with screws and an Allen wrench to mount.
  18. AlwaysOnTheGo

    For sale: Sig Sauer M400 Tread M-Lok Handguard - $60

      1. For Sale
    • $60
    • Vancouver
    • Washington
    For sale is a like new oem 15" Sig Sauer M400 Tread M-Lok handguard. Nothing wrong with it, just swapped it out for the 13" version. Used once at the range (less than 50 rounds) before I took it off. (The white specs in the attached pics are lint) Will meet face to face in Hazel Dell area of...
  19. OneEightNate

    15” UTG Pro Super Slim M-LOK Handguard

      1. For Sale
    • $50
    • Portland
    • Oregon
    15” UTG Pro Super Slim M-LOK free floating AR platform handguard in black. It’s in really great shape with no damage, dents or scratches. It comes with all the original parts and accessories you need to mount it up: Handguard Barrel Nut Barrel Nut Shims Barrel Nut Wrench Mounting Hardware...
  20. HaynProdigy808

    Geissele URG-I Complete, Clone with Geissele Lower - Complete Rifle Package

      1. For Sale
    • $2100
    • Oregon City
    • Oregon
    For sale is an EXTREMELY RARE Geissele URG-I Complete, Clone paired with a Geissele Super Duty Lower Receiver and Surefire M300V Scout Light. The URG-I and lower were purchased directly from Geissele during their very limited run. The Surefire M300V was purchased directly from Surefire. Please...
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