BCM ORAT52513X5 A/T Optic Riser 525-13X5 Black Anodized 18 SlotsThe A T Optic Riser 525 13x5 is approximately 7 1 4 long and is intended to be used similarly to the 525 10x5 but offers 3 additional recoil slots for more flexibility. This riser has 13 recoil slots on the main body, and 5 on the cantilever section for a total of 18 slots (19 lugs). Ideal for layering magnifiers and other enhancement systems with red dot optics, BCM A T Risers offer the potential for a more capable platform that can improve threat