LaRue Tactical LT733 Magpul CTR Rifle Stock POD Prone Optimization Device Converts your Magpul CTR into a precision-rifle stock Places a 1.75" section of MIL-STD-1913 rail on the bottom of a Magpul CTR buttstock Raises the stock up to level the rifle when shooting in the prone For optimum control in stock-seating and can even fine-tune sight picture Bottom also gives additional traction into bench rest bags when not using an extension