A3 Industries +10 Degree Picatinny Mini Modular Vertical Foregrip - 2.75in HK Grooved Grip Black. Its modular two-piece design supports four interchangeable grip bodies and is offered in both Picatinny and M-LOK versions. Each grip is machined from 6061 aluminum with a low-gloss black anodized finish and secured using a heavy-duty 5/16'' main stud. The Picatinny model occupies only 2 rail slots (1-1/8'' of space) while the M-LOK version mounts using one slot and 1-5/16'' of space. made in specialized factories. Specifications for A3 Industries +10 Degree Picatinny Mini Modular Vertical Foregrip - 2.75in HK Grooved Grip: Manufacturer: A3 Industries Color: Black Material: Aluminum Length: 2.75 in Mount: Picatinny Package Contents: A3 Industries +10 Degree Picatinny Mini Modular Vertical Foregrip - 2.75in HK Grooved Grip A3 Industries VFG-198: +10 Degree Picatinny Mini Modular Vertical Foregrip - 2.75in HK Grooved Grip Black