KMRNL V4 Bag Rider

Why It Exists

The Sig Sauer Cross is lightweight, compact, and field-capable, but the factory rear chassis geometry does not provide an ideal dedicated surface for rear-bag use.
The narrow and uneven rear contact area can make fine elevation control, repeatable support, and smooth tracking more difficult in prone, bench, and field shooting positions.

The KMRNL V4 Bag Rider solves that problem by adding a longer and more controlled rear support surface under the rifle.
The wider rear section helps stabilize the rifle on the bag, while the angled ramp gives the shooter a more predictable way to raise or lower the rifle during position adjustment.

Key Benefits

• Improved rear-bag stability: The wider rear section increases bag contact and helps reduce side-to-side roll.
• Controlled elevation adjustment: The 9-degree ramp allows smoother elevation changes by moving the rifle forward or backward on the rear bag.
• Smoother rifle tracking: A longer bag-contact surface helps the rifle move more consistently during recoil and position adjustment.
• Repeatable rear support: The flat base section gives the shooter a stable reference surface for repeatable setup between shots.
• Reduced snagging: The ramped front profile helps reduce hard edges that can catch on bags, packs, or field supports.
• Better field usability: Useful from prone, bench, pack-supported, and improvised field shooting positions.

Design Details

The V4 geometry was built to give the shooter both movement and stability.
The ramp section supports controlled elevation changes, while the flat section provides a consistent rear support surface once the rifle is settled into position.

Fitment

• Platform: Sig Sauer Cross rifles
• Product type: Rear bag rider / rear support surface
• Use: Rear bags, shooting rests, packs, and field supports

Manufacturing

Produced by KMRNL using precision additive manufacturing for a lightweight, functional, and purpose-built rifle support component.
The V4 Bag Rider is designed as a practical field-use upgrade, not a cosmetic accessory.

Use Case

The KMRNL V4 Bag Rider is intended for shooters who want better control from the rear of the rifle.
It is especially useful when shooting from a rear bag, prone position, bench rest, pack-supported position, or improvised field support.

The goal is simple: less fighting the rear bag, more repeatable rifle control.