Samson Manufacturing Corp. Vertical Forend Grip, Fits AR-15 Rifles, 4, Black 04-01010-01 Samson's M-LOK Vertical Grips are made of solid aluminum with a steel rod for maximum strength. The M-LOK adapter plate is designed to M-LOK spec and will mount to all M-LOK attachment points. The two-piece design allows you to remove the grip from the rifle while leaving the attachment lug in place.