Samson Manufacturing Corp. Vertical Foregrip, Anodized Finish, Black, Fits M-LOK, Medium (3.5), Grenade Design 04-05103-01 Samson Vertical Grips are renowned in the shooting world for their quality. Our Vertical Grips are available with M-LOK" KeyMod" or Evolution attachment plates. The two-piece design allows you to remove the grip from the rifle while leaving the attachment lug in place. Samson Vertical Grips are made of solid aluminum and stainless steel for their unmatched durability and dependability.