The B&T Industries Sig Sauer Cross Buttstock Rail Kit BT78 is a 2.05-inch Picatinny rail designed to install directly onto the folding buttstock of the Sig Sauer Cross rifle. This rail allows for mounting Accu-Shot Precision Rail Monopods, enhancing the stability and accuracy of your rifle. Machined from 6061-T6 aluminum with a Mil-Spec Type III Class 2 finish, the BT78 ensures durability and reliability. Installation requires no modification, utilizing factory threaded holes for a secure fit. Ideal for precision shooting, the B&T Industries Sig Sauer Cross Buttstock Rail Kit provides a versatile platform for monopod attachment.