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B5 Systems Modular Picatinny Stock Black MPS 1553 UPC 814927023604
Product Description
The B5 Systems Modular Picatinny Stock in Black (MPN: MPS-1553) is a modern, high-performance side-folding stock assembly engineered to bring B5's combat-proven ergonomic features to bufferless rifle and pistol-caliber carbine (PCC) platforms. Purpose-built to interface directly with any rear MIL-STD-1913 Picatinny rail endplate, the MPS-1553 eliminates traditional receiver extensions, delivering a streamlined, highly adaptable shoulder-support architecture for platforms like the SIG MCX/MPX, CZ Scorpion, Ruger LC Carbine, and BRN-180 builds.
Precision-molded from high-strength reinforced polymer composites and fitted with color-matched steel locking hardware, the stock features an integral left-side folding steel hinge that locks solidly in both folded and extended positions. Designed with user ergonomics in mind, it provides a 2-1/4" collapsible length-of-pull (LOP) adjustment range to accommodate various body armor configurations, body types, and tactical stances. An integrated spring-assisted cheekpiece adds 1/2" of vertical riser adjustment, ensuring optimal eye alignment with elevated micro red dots and LPVO optics.
Equipped with ambidextrous fixed sling loops as well as anti-rotational steel quick-disconnect (QD) sling sockets, the stock accommodates various 2-point and 1-point sling routing preferences. A cushioned, non-slip rubber buttpad reduces felt recoil while keeping the stock planted firmly against the shoulder during rapid firing sequences. Backed by B5 Systems' reputation for duty-grade durability, the MPS-1553 is the ultimate modular stock solution for compact, modern tactical builds.
Armorer Bench Notes & Real-World Staging Guidance:
Fitment Matrix: Mounts to any rear vertical 1913 Picatinny rail interface (SIG SAUER MCX/MPX, CZ Scorpion EVO with 1913 endplate, Ruger LC Carbine / PC Charger, AK 1913 stock adapters, B&T, and BRN-180 bufferless lower receivers). (Note: Designed strictly for BUFFERLESS firearm operating systems that do not require a buffer and recoil spring inside an extension tube to cycle; attempting to fire a standard AR-15 direct-impingement system with this stock installed will cause severe receiver damage).
- Perform a complete firearm safety check: drop the magazine, lock the bolt or charging handle rearward, and visually inspect the chamber to verify zero live rounds are present.
- Loosen the integrated 1913 Picatinny cross-clamp screw on the B5 stock mounting hinge using an Allen key.
- Slide the clamp mechanism downward over the rear vertical 1913 Picatinny rail section of your receiver until positioned at the desired rail slot height.
- Torque the cross-bolt clamp screw to manufacturer specification (approx. 25–30 in-lbs) to lock the hinge housing permanently onto the rail.
- To fold: pull back firm upward pressure on the stock body to unlock the internal hinge detent and pivot left toward the receiver wall.
- To deploy: swing the stock outward until the steel lockup mechanism snaps crisp and flush into the inline firing position. Test length-of-pull and cheekpiece riser functions before range deployment.
Key Features
- 1913 Picatinny Mount Interface: Attaches directly to any rear 1913 Picatinny endplate, eliminating the need for traditional AR buffer tubes.
- Integral Left-Side Folding Steel Hinge: Heavy-duty steel hinge mechanism folds tightly against the receiver for compact vehicle staging and backpack transport.
- Collapsible Length of Pull Adjustment: Provides 2-1/4 inches of LOP movement to precisely match shooter ergonomics and gear staging.
- Spring-Assist Adjustable Cheekpiece: Integrated riser provides up to 1/2 inch of vertical cheek-weld adjustment for optimal optic alignment.
- Multi-Position Sling Mounts: Features ambidextrous fixed sling slots and anti-rotational steel QD swivel sockets.
- Cushioned Non-Slip Rubber Buttpad: Absorbs recoil forces and prevents shoulder slipping during rapid strings of fire.
Product Specifications
- Brand: B5 Systems
- Model/Series: Modular Platform Stock (Picatinny)
- MPN / SKU: MPS-1553
- UPC: 814927023604
- Mount Type: MIL-STD-1913 Picatinny Rail Clamp
- Platform Compatibility: Bufferless Firearms w/ Rear 1913 Rail (SIG MCX/MPX, CZ Scorpion, BRN-180, AK 1913 Adapters)
- Material: High-Strength Composite Polymer w/ Steel Hardware
- Finish / Color: Black
- Dimensions: 8.06" L x 1.76" W x 4.67" H
- Weight: 16.8 oz
- Country of Origin: USA
