New frontend accessory from Begadi... "Metal RAS for almost all M4/M15 weapons. Should only be mounted at weapons with a long outerbarrel. For weapons with short outerbarrels (for example M933, M4 CQB), the RAS 7'' should be used. To assemble the RAS, the deltaring must get screwed off, and the RAS screwed on. Accessories can be mounted at the RAS."