B5 Systems Introduces The Modular Platform Stock

In the world of modern rifles, adaptability isn’t just a luxury—it’s a requirement. The B5 Systems Modular Platform Stock takes that principle and turns it into hardware, delivering a rugged, user-focused solution designed for shooters who demand versatility, precision, and durability without compromise.

Engineered for the Evolving Rifle

At its core, the B5 Modular Platform Stock is built around mission-focused modularity. Anchored by a rock-solid 1913 Picatinny interface, it mounts up with ease and stays locked in, no matter how dynamic your application. Whether you’re running a PDW, a DMR, or something entirely custom, this stock flexes to fit your setup.

One of its standout features: a left-side folding steel hinge. It folds flat and tucks tight, offering a compact footprint for storage or transport without sacrificing readiness. The steel construction? Built to take a beating.

Adjustability Where It Counts

Fine-tuning your rifle’s ergonomics can make or break your performance. That’s why the stock includes a 2.25-inch adjustable length of pull, giving you control over fit and comfort whether you’re geared up in armor or running slick. And with a spring-assisted cheek riser that boosts comb height by half an inch, you get a more consistent cheek weld—critical when precision matters.

Purpose-Driven Mounting Options

The rear of the stock integrates ambidextrous sling points, including fixed loops and steel anti-rotation QD sockets. Whether you’re running a two-point or single-point sling, it’s built to stay stable and out of your way. No twisting. No spinning. Just reliable connection where you want it.

Built to Endure

Crafted from high-strength composite with color-matched steel hardware, every inch of this stock is designed to stand up to hard use. From the non-slip cushioned buttpad that absorbs recoil to the robust locking mechanisms throughout, it’s all engineered with longevity in mind.

Available in Mission-Ready Colors

Choose from a full range of professional finishes to match your loadout or blend into your environment. And like all B5 Systems products, this stock is proudly made in the USA—built by professionals, for professionals.

SPECS AT A GLANCE:

• 2.25” LOP adjustment for custom fit

• Spring-assisted cheek riser adds 0.5” of height

• Left-side folding steel hinge for compact transport

• Ambidextrous sling mounts, fixed and QD-compatible

• Non-slip buttpad for enhanced control

• Steel hardware, color-matched for a uniform finish

• 1913 Picatinny rail mount interface

• USA-made quality

• MSRP: $200

Whether you’re modernizing a legacy platform or dialing in the final details on a fresh build, the B5 Modular Platform Stock offers a blend of precision, strength, and real-world flexibility. No gimmicks. Just solid, performance-ready hardware designed to keep pace with your mission.