The Magpul XTM Hand Stop Kit MAG511 is a four-piece kit for 1913 Picatinny rails that provides a forward reference point for the support hand and textured rail covers.
The hand stop prevents the hand from moving forward toward the muzzle during firing; locking tabs keep the pieces together even under heavy use, and TSP-textured surfaces improve grip. A 1/8" hex key is required for installation.