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B5 Systems built its reputation on tough, no-nonsense AR-15 furniture, and the Modular Picatinny Stock takes those same features and opens them up to any firearm running a rear 1913 Picatinny interface. That means it works great on monolithic bolt carrier setups, short-stroke piston guns, and bufferless builds where a traditional receiver extension just isn't in the cards. Bolt it straight to the rail and you're set with a solid, repeatable shoulder platform.
The standout here is the integral left-side folding steel hinge, which lets you fold the stock flat for tighter storage or transport without giving up strength. Once you're ready to run, it snaps back into a rigid, locked position. The collapsible length of pull adjusts about 2 1/4 inches, so you can dial in the fit whether you're shooting bare-armed in summer or bundled up in a heavy jacket. Small tweaks like that make a real difference when you're behind the gun for a while.
Comfort and consistency go hand in hand, and the spring-assist cheekpiece adds about a half inch of height for better sight or optic alignment. The mechanism is simple: pull back and push up to raise it, pull back and push down to drop it. The cushioned non-slip buttpad keeps the stock planted on your shoulder and takes some of the sting out of recoil. For sling setups, you've got ambidextrous fixed sling mounts plus steel anti-rotation QD sockets, so you can rig it your way on either side.
Construction is durable composite paired with color-matched steel hardware, giving it that clean, uniform Flat Dark Earth look while keeping the guts rugged enough for daily wear. It's a well-rounded stock for anyone building out a compact rifle, PDW, or suppressed setup who wants B5 quality on a Picatinny mount.
It mounts directly to a rear 1913 Picatinny rail, so there's no traditional buffer tube or receiver extension needed. That makes it a natural fit for monolithic bolt carrier guns, short-stroke piston systems, and other bufferless platforms. As long as your firearm has that rear Picatinny interface, this stock bolts right on.
Yes. It uses an integral left-side folding steel hinge that lets you fold it flat for compact storage or transport. When you're ready to shoot, it locks back into a solid, rigid position with no wobble.
The spring-assist cheekpiece adds about a half inch of height for better alignment with your optic or irons. To raise it you pull back and push up, and to lower it you pull back and push down. It's a quick, tool-free adjustment you can make right on the range.
The stock includes ambidextrous fixed sling mounts on both sides plus steel anti-rotation QD sockets. That gives you flexibility to set up a fixed loop or a quick-detach sling however you prefer. The QD sockets are reinforced with steel to keep everything secure under load.
| UPC | 814927023611 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | MPS1554 |
| Color | Flat Dark Earth |
| Model | |
| Product Type | Stock |
| Style | Collapsible |
| Length | 8.06" |
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