BT78: SIG SAUER® CROSS™ Buttstock Rail Kit
The BT78 adds a rear Picatinny rail to the Sig Sauer Cross buttstock, so you can mount an Accu-Shot monopod for rear elevation control on the Cross platform. It is the part that turns a Cross into a front-and-rear precision setup when paired with an Atlas bipod. Machined in the USA and backed by a lifetime warranty.
Built to a Standard
Key Features
It gives the Sig Cross buttstock a rear mounting rail. The BT78 fits the Cross stock and provides a Picatinny rail at the rear so an Accu-Shot Precision Rail Monopod can mount for elevation control.
Adds a rear Picatinny rail to the Sig Sauer Cross buttstock
Lets an Accu-Shot rail monopod mount for rear support
Completes a front-and-rear platform with an Atlas bipod
Knowledge Is Power
Frequently Asked Questions
Still weighing whether the BT78 Sig Cross Buttstock Rail Kit is right for your rifle? These quick answers tackle what we get asked most: how the options compare, what fits your rifle, and where it is made.
What is the BT78 rail kit?
The BT78 is a buttstock rail kit that adds a rear Picatinny rail to the Sig Sauer Cross stock, so an Accu-Shot monopod can mount for rear elevation control.
What does it let me mount?
It lets you mount an Accu-Shot Precision Rail Monopod at the rear of the Cross, which pairs with an Atlas bipod up front for a full front-and-rear shooting platform.
Does it fit any rifle or just the Sig Cross?
The BT78 is made specifically for the Sig Sauer Cross buttstock. Other rifles use different buttstock rail kits or sling-stud monopods; confirm your stock before ordering.
Why add a rear monopod to my Cross?
A rear monopod lets you dial and hold elevation on target without a rear bag, making the Cross steadier and more repeatable, especially paired with an Atlas bipod up front.
Is the BT78 made in the USA?
Yes. The BT78 is machined in the USA by B&T Industries and backed by a lifetime warranty.