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The B5 Systems MPS1553 Modular Platform Stock solves a problem AR guys have wrestled with for years: how to get a true folding stock on a rifle without a LAW folder or some workaround. Thanks to the rise of bufferless uppers, this one bolts straight onto any 1913 Picatinny rear mount and gives you a left-side folding hinge with the shooting feel of a solid fixed stock. It's built from durable composite with color-matched steel hardware, so it holds up to rough handling without adding a bunch of dead weight at 16.8 ounces.
The left-side folding steel hinge lets you collapse the rifle for storage or transport, and when it's locked out, the extended lock-up feels rock solid, just like shooting off a fixed stock. On short-barrel builds it can fold the overall package down considerably, and the hinge sits high enough that you can still reach the grip and trigger with it folded if the situation calls for it. This opens the door to pistol-caliber carbines, .22 rimfire ARs, and even some shotgun platforms, not just standard AR uppers.
You get 2 1/4 inches of collapsible length of pull adjustment through a low-profile latch, so it fits shooters of different sizes and works with plates and armor. The adjustable spring-assist cheekpiece raises a half inch of height for proper eye-to-optic alignment, and it's easy to work: pull back and push up to raise, pull back and push down to drop it. A cushioned nonslip buttpad keeps things planted on your shoulder under recoil.
Ambidextrous fixed sling mounts pair with steel anti-rotational QD sockets, so lefties and righties both get solid attachment points without the QD swivel spinning loose. It's a practical, field-ready setup that carries the same reputation for toughness B5 built with their SOPMOD and Bravo stocks. If you've been holding off on a folder for your AR-pattern gun, this is one of the cleaner ways to get there.
The MPS attaches to any firearm with a 1913 Picatinny rear mount, which makes it a natural fit for bufferless AR uppers, pistol-caliber carbines, and .22 rimfire ARs since those don't need a buffer tube. It even works on some shotgun platforms with the right rear interface. It won't work on a standard AR that still uses a buffer tube and recoil spring.
Yes, the hinge sits high enough that you can still access the grip, trigger, and fire controls when it's folded to the side. That means you can fire the gun folded if you need to in a pinch. For normal shooting you'll extend and lock it, where the lock-up feels solid like a fixed stock.
It gives you 2 1/4 inches of collapsible length of pull adjustment through a low-profile latch. That's enough range to fit different body types and to run it comfortably with plate carriers or heavier clothing. The adjustment is quick and doesn't require tools.
It does. The stock includes ambidextrous fixed sling mounts along with steel anti-rotational QD sockets, so you get solid attachment points on either side. The anti-rotational design also keeps your QD swivel from spinning loose during use.
| UPC | 814927023604 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | MPS-1553 |
| Color | Black |
| Length | 13.2000 |
| Model | |
| Product Type | Stock |
| Shipping Weight | 1.303 |
| Style | Collapsible |
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