After doing a lot of reading on KEYMOD and how it's almost an elitist platform with companies like KAC using all sorts of proprietary parts that require professional installation. I could see a low cost open source thing like M-Lock taking off.
Try a bit harder. Keymod accessories are not proprietary. They're no more difficult to install than pic rail accessories. Elitist platform? Here's a list of companies offering keymod system.
Aero Precision USA, EK-Series handguard series.
ALG Defense (announced 1/7/14)
AM-TAC Precision / Ambush Tactical - KRS V2 QIK System
Arsenal Democracy, AD Rail handguard series.
Barrett Firearms Manufacturing REC7 Gen II and 98B rifle series.
Bravo Company MFG, KMR series (announced 7/19/13)
B5 Systems, polymer handguard
CMMG Inc. RKM-series
Coronado Arms, Inc.
Daniel Defense M4 V11 Carbine Series, SLiM KeyMod Rail System.
Ergo/Falcon Industries, Ultra Lite Z Handguard (announced 8/3/14)
Fortis MFG, REV and Switch Series
Geissele Automatics MK4KM (announced 5/21/13)
Head Down Products, LLC. Provectus Handguard Series
Heckler & Koch MRS Series (proprietary design, reversing the key-slot direction and spacing)
Hera Arms (under development)
ICE Arms, HG-SR12
Jesse James Firearms Unlimited (JJFU) Nomad Handguard, Rifle and Carbine Series.
KAK Industries
Knight's Armament URX4
Krebs Customs (Announced SHOT Show 2013)
Mega Arms, MKM-series
Midwest Industries MI 17K, Rail systems for Tavor and SCAR rifle series.
Noveske Rifleworks, NSR-series
Odin Works, KMod-series
Parabellum Armament LLC, AK-BAR (AK47 Battle Adaptive Rail) and the AR-BAR (AR15 Battle Adaptive Rail).
Parallax Tactical FFSSR Keymod series
Primary Weapon Systems (PWS)
Quentin Defense KMR Series (announced 11/7/13)
Riverman Gun Works, MBR Rifle and Handguard series (announced 1/14/14)
Robinson Arms, XCR Rifle Series (announced 1/14/14)
Samson Manufacturing Corp. (Debuting at SHOT Show 2014)
Seekins Precision MCSR-V2
SIG Sauer, MPX series carbines
SLR Rifleworks
Spikes Tactical BAR/SAR series (announced 5/11/13)
Strike Industries Mega Fins series (announced 6/21/13)
Troy Industries (announced November 2013 in Canada: Retailers tradeshow)
VLTOR Weapon Systems, VIS-KM and CASV-KM series
556 Tactical, Stryke KeyMod Rail (SKR) series