Kalashnikov USA is proud to introduce our long awaited Eastern Bloc inspired K-21 M-LOK rail. We have been hard at work in our skunkworks coming up with some of the best quality products for the AK 100 series platform and our KR-9 series of firearms. This rail is tough as nails and super slick!! - K-21 Rail features: - four M-LOK slots on each side of the lower handguard - Matching upper handguard with recessed 5 slot 1913 rail - 2-15 slot M-LOK Proprietary rail sections. - four long screws & M-LOK nuts for lower rail - four short screws for upper handguard (BLACK) - Material: Magnite - THIS RAIL IS COMPATIBLE WITH OUR KR-103 7.62X39MM RIFLE AND OUR KP-9/KR-9 SERIES OF RIFLES - Dimensions: - Lower Length- 6.29 - Upper Length- 3.85