AR15/M16 magazine holder clamps onto any Picatinny rail allowing the operator to position a spare magazine for quick access reducing loading time - Ideal for use with our CBS collapsible stock or PRFCS Picatinny rail for existing collapsible stocks - No straps to contend with MPS magazine holder retains mag firmly while allowing removal with the touch of a finger on the ergonomic lever - Fully ambidextrous design accepts M16/AR15 style aluminum magazines - Can be belt mounted using RC1/RC2 belt clip - High density polymer construction - Fits: AR15/M16 - Made of: Polymer - Weight: 2.1oz - Width: 1.5 - Length: 4 - Height: 3