Probably Foliage, but that's just a guess.
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I would say just buy the black and paint them. It is easy and fun. A can wil last you a LONG time.
Aim surplus also has them in OD green
Even better. I like the OD furniture best.
Midway tells me my OD Midlength handguards will be in 12/31. This is probably the 30th date given since I ordered them in April. There is a definite Lucy - Football - Charlie Brown thing going on here.
OD Krylon is your friend.:D