Stock Fdeb5 Systems Modular Picatinny

The B5 Systems Modular Picatinny stock is a modern, feature-rich buttstock designed for shooters who demand adjustability and real-world functionality on their rifles. Built around a 1913 Picatinny mounting interface, this composite and steel stock delivers the ergonomic control and durability you need whether you're running precision rifle drills, hunting, or training at distance. It's the kind of stock that rewards time spent fine-tuning your setup.

What sets this platform apart is its genuine adjustability—not just marketing talk. The length of pull collapses over a 2¼-inch range, so you can dial in your exact fit whether you're shooting in shirt sleeves, wearing a tactical vest, or layering up for cold-weather hunting. The spring-assist cheekpiece rises an additional ½ inch, letting you dial in your sight picture without stacking shims or compromise. Those aren't trivial tweaks; they're the difference between a stock that works and one that just hangs there.

The hardware reflects practical thinking too. Ambidextrous QD sling mounts let you run your sling the way that works for your grip and shooting style, while the steel anti-rotation design keeps things from drifting on you mid-string. The left-side folding steel hinge gives you the option to collapse the stock when you need a compact profile. A cushioned, non-slip buttpad rounds it out—no creep, no slipping when you're behind the gun. All hardware is color-matched, keeping the aesthetic clean.

If you're building or upgrading a Picatinny-equipped AR or modern sporting rifle and want a stock that actually *adjusts* to fit you instead of making you work around it, this is a solid choice.

Key Features

• 1913 Picatinny interface for quick installation and removal
• 2¼-inch collapsible length of pull adjustment—dial in your fit
• Spring-assist cheekpiece adds ½ inch of riser height for sight alignment
• Left-side folding steel hinge for compact profile when needed
• Ambidextrous fixed and quick-disconnect sling mounts
• Steel anti-rotation QD hardware prevents sling drift
• Cushioned, non-slip buttpad for secure contact
• Durable composite construction with color-matched steel hardware

Specifications

Frequently Asked Questions

What rifles will this stock fit?

Any rifle or platform with a 1913 Picatinny-compatible rail receiver extension. AR-15s and AR-10s are the most common application. Verify your platform uses a Picatinny mount interface before ordering.

How much can I adjust the length of pull?

The stock collapses over a 2¼-inch range. Combined with the ½-inch cheekpiece rise, you have solid flexibility to match your shooting position and gear configuration.

Is the cheekpiece removable?

The cheekpiece is spring-assisted and integral to the stock design. It's adjustable for height but not removable.

Can I use this stock with a sling?

Yes. The stock features ambidextrous fixed sling mounts and anti-rotation quick-disconnect points so you can run a two-point sling configured the way you prefer.