Bill Geissele of Geissele Automatics this year introduced a new modular rail for the AR15, as well as a similar design for highly popular (among LE/MIL) HK 416 platform. Utilizing a replacing barrel but the rail replicates the locking process found in the HK416 rails, using two tension screws. The user can then add rails where needed, and the rail features a slick design with integrated QD points.