With the hk vp9a1 upgrades revolve around an improved trigger; grip frame and the controls.Featuring an enhanced nickel-teflon coated trigger; adjustable lop and customizable grip with included backstraps; high visibility tritium front sight with a clean, black serrated rear sight; flared mag well; improved ambidextrous controls; serrated surface on the frame provides a tactical reference point, recess cut in magazine case base.Includes holosun scs red dot, two magazines, interchangeable backstraps and side grips.Heckler & Koch VP9A1 F SpecificationsCaliber: 9mmAction: Semi-automatic, striker-firedBarrel Length: 4.5 inchesFinish: Matte blackSights: Front night sightCapacity: 15+1 rounds (two 15-round magazines included)Optic: Holosun SCS (included)Grip: Ergonomic designOverall Length: 7.95 inchesWeight: Approx. 25.56 oz