The Atlas BT29 TRG Rail Kit is designed allow the installation of the Accu-Shot BT12 or BT12-QK Prescision Rail Monopods. Made in AmericaNote: The BT29 TRG Rail Kit does require that the buttpad be temporarilly removed and that a second hole be drilled into the stock. While this can be completed with common hand tools the manufacturer reccomends that installation of the BT29 be completed by a gunsmith. Atlas B& T Industries Sako TRG Rail Kit - compatible with BT12-QK only BT29