KRISS USA Ambidextrous Folding Stock for GEN 2 1 Vector Black KVA FSBL30 KVAFSBL30 UPC 810237029688
Product Description
The KRISS USA® Ambidextrous Folding Stock for GEN 2.1 Vector (SKU: KVA-FSBL30 / UPC: 810237029688) delivers the definitive factory shoulder interface engineered specifically for the modernized post-2017 KRISS Vector receiver. Purpose-built to restore the iconic Swiss-designed submachine gun aesthetic while maximizing dynamic handling, this robust folding stock equips tactical operators, law enforcement professionals, and registered SBR owners with rapid deployment, rock-solid lockup, and tailored cheek weld geometry for high-cadence carbine operations.
Engineered for maximum operational endurance, the stock chassis utilizes a hybrid material architecture combining high-strength glass-filled polymer with a CNC-machined aerospace-grade aluminum hinge knuckle. The aluminum mounting collar is treated with a resilient MIL-A-8625 Type III Class 2 hardcoat anodize that resists corrosion, abrasion, and aggressive chemical bore cleaners. The internal locking mechanisms, hinge pin, and detents are precision-machined from heat-treated hardened steel, guaranteeing that cyclic bolt impulses from 9mm, 10mm Auto, and .45 ACP calibers do not induce vertical play or horizontal hinge loosening over tens of thousands of rounds.
Designed with true modularity in mind, the hinge mechanism is completely ambidextrous and can be configured by the armorer to fold cleanly to either the left or right side of the Vector chassis depending on operational preference and sling configuration. In addition to lateral folding capability, the stock incorporates a 3-position telescoping length of pull (LOP) ranging from 8.5 inches to 10.5 inches to accommodate varied body armors and shooting stances. Bilateral Quick Detach (QD) sling swivel sockets and an integral rear lanyard sling loop ensure seamless integration with modern tactical sling setups.
*Armorer Bench Notes & Real-World Staging Guidance:*
Fitment Matrix: Direct chassis installation into the rear cylindrical housing of KRISS Vector Gen 2.1 (Gen 2-2017 and newer) carbine and rifle upper receivers. CRITICAL: Will NOT fit Gen 1 or early Gen 2 Vector uppers equipped with the integrated proprietary hinge knuckle. NFA WARNING: Installing this stock onto a KRISS Vector SDP pistol with a barrel under 16 inches constitutes manufacturing a Short-Barreled Rifle (SBR) under the National Firearms Act (NFA) and requires an approved ATF Form 1. Mounting screw must be torqued to 25 to 30 in-lbs with medium-strength blue threadlocker; do not over-torque into the upper housing.
- Ensure the host KRISS Vector is completely clear, magazine removed, bolt locked rearward, and the chamber visually and physically confirmed empty.
- Remove the factory rear sling loop plug, receiver end cap, or pistol buffer tube adapter by loosening the internal receiver retaining hardware from within the upper housing.
- Slide the included KRISS cosmetic alignment ring over the forward circular collar of the KVA-FSBL30 stock hinge mount.
- Insert the stock hinge stem into the rear receiver cavity, thread the provided M5x0.8mm mounting screw through the interior receiver bracket, apply blue threadlocker, and torque to 25–30 in-lbs.
- Actuate the hinge push-button to verify positive lockup in battery, cycle the 3-position telescoping strut, and perform a master safety and functional clearance check prior to live-fire staging.
Key Features
- Ambidextrous Reversible Hinge: Configurable to fold cleanly to either the left or right side of the Vector upper housing to suit left-handed or right-handed shooters.
- Three-Position Telescoping LOP: Adjusts seamlessly between 8.5", 9.5", and 10.5" length of pull to accommodate body armor, chest rigs, and varying shooter statures.
- Hybrid Aluminum & Polymer Architecture: Billet 7075-T6 hardcoat anodized hinge bracket paired with an impact-modified composite stock arm for optimal balance and durability.
- Hardened Steel Pivot Hardware: Precision-ground steel cross-pins and detents eliminate hinge wobble and withstand severe cyclic sub-gun recoil impulses.
- Bilateral QD Sling Swivel Sockets: Houses integrated steel-reinforced push-button QD sockets on both flanks alongside a rear 1.0-inch web sling slot.
- Direct-Fit Gen 2.1 Architecture: Mounts flush to the factory receiver socket using the included M5x0.8mm mounting screw and cosmetic ring without aftermarket adapters.
Product Specifications
- Brand: KRISS USA®
- Model/Series: Ambidextrous Folding Stock for GEN 2.1 Vector
- MPN / SKU: KVA-FSBL30 / KVAFSBL30
- UPC: 810237029688
- Hinge Material: CNC-Machined Aerospace Aluminum (MIL-A-8625 Type III Hardcoat Anodized)
- Stock Body Material: Fiber-Reinforced Impact-Modified Polymer
- Hardware Metallurgy: Hardened Carbon Steel (Black Oxide / Nitride)
- Length of Pull Settings: 3 Positions: 8.5" (216 mm), 9.5" (241 mm), 10.5" (266 mm)
- Fold Direction: Reversible (Left or Right Folding)
- Mounting Hardware: M5x0.8mm Fastener & Alignment Cosmetic Ring Included
- Sling Mount Interfaces: Dual Left/Right QD Sockets & 1.0" Rear Sling Loop
- Platform Compatibility: KRISS Vector Gen 2.1 (Gen 2-2017) Upper Receivers
- Country of Origin: United States
