Forward Controls Design Aimpoint ACRO P1 and P2 and HK VP9 Adapter Plate Black OPF-VP9 ACRO. When paired with the VP9 Tactical's taller suppressor height sights the OPF-VP9 ACRO offers a lower 1/3 co-witness with Aimpoint ACRO P1/P2 optics. For those using Steiner MPS optics the larger window size ensures full visibility of the front tritium through the sight window. Additionally XS Sights which can be found on the VP9 Tactical also offer co-witnessing sights compatible with RMR and ACRO optics. Specifications for Forward Controls Design Aimpoint ACRO P1 and P2 and HK VP9 Adapter Plate: Manufacturer: Forward Controls Design Red Dot Sights-Footprint: Aim Point Acro Optic Cut: Aimpoint ACRO Fabric/Material: 4140 Steel Color: Black Gun Model: Heckler & Koch VP9 Finish: Nitride Gun Make: Heckler & Koch Package Contents: Forward Controls Design Aimpoint ACRO P1 and P2 and HK VP9 Adapter Plate What firearm models does the manufacturer say Forward Controls Design Aimpoint ACRO P1 and P2 and HK VP9 Adapter Plate is compatible with? The manufacturer says that Forward Controls Design Aimpoint ACRO P1 and P2 and HK VP9 Adapter Plate is compatible with Heckler & Koch VP9Forward Controls Design OPF-VP9 ACRO: Aimpoint ACRO P1 and P2 and HK VP9 Adapter Plate Black