The MK18 FSP is only available in FDE in VERY limited quantities. There are only about 100 in existance. We are completely out right now with no intentions of making another batch any time soon. these are the same length as our standard MK18 Rail Systems and are compatible with the KAC NT4 Suppressor, Surefire Suppressors, and the Gem-Tech G5 with MK18 Suppressor Mount.
S/F
Joe