Magpul's GEN M3 PMAG will be available in MCT(Medium Coyote Tan) in February 2017. Parts number is MAG556-MCT and MAG557-MCT.
M-LOK GI Sling Swivel is now available. It is a traditional sling swivel but is made for M-LOK compatible systems. It accepts up to 1-1/4" sling.
Price is $19.95