Forward Controls Design AR15/AR10 Buffer Retainer Silver. RBF features a reinforced tip that is 10percent larger (0.102) than TDP spec (0.093). We don't want RBF to be timed (as the case with a rectangular tip) so RBF retains the TDP buffer retainer's versatile round tip and is installed per TM instructions. 10percent is as much as we could increase before encountering receiver extension timing incompatibilities. RBF is compatible with AR15/M16 milspect rifle and carbine receiver extensions as well as Vltor A5 system receiver extensions. Specifications for Forward Controls Design AR15/AR10 Buffer Retainer: Manufacturer: Forward Controls Design Gun Model: AR-10 AR-15 Color: Silver Fabric/Material: Stainless Steel Finish: Heat Treated Gun Make: AR Platform Package Contents: Forward Controls Design AR15/AR10 Buffer Retainer Forward Controls Design RBF: AR15/AR10 Buffer Retainer Silver