BE Meyers released their attachment system MAWL last year, and the commercia version(C1+) is now available. Priced at $2500, it is twice that of a competitor's but the design is probably in a class of its own.
TNVC has some
https://tnvc.com/shop/b-e-meyers-mawl-c1-ir-visible-laser/
You can read more about MAWL from Soldier Systems Daily
http://soldiersystems.net/2017/03/07/be-meyers-co-unveils/
and how engineers learned things they needed to know
http://soldiersystems.net/2016/08/22/the-birth-of-the-be-meyers-mawl/
From: Soldier Systems Daily