Soldier Systems Daily got the report of study by NSWC-Crane regarding the various modular rail systems. It basically states that M-LOK outperformed other modular rail system, sometimes by a wide margin.
The test was done for repeatability, endurance, rough handling, drop testing, and static failure load.
http://soldiersystems.net/2017/03/31/ussocom-selects-m-lok-for-weapon-programs/
From: Soldier Systems Daily
