B&T USA APC9-SD PRO Medium Handguard - M-LOK Interface System (3, 6, 9 O'Clock Positions), 6061-T6 Aluminum, Matte Black Hard Anodized Finish - BT-361579
Product Description
Upgrading the modular front end of an integrally suppressed submachine gun platform requires a handguard engineered to precise architectural tolerances. Standard universal rails or legacy quad Picatinny handguards on suppressed firearms add unnecessary bulk and transfer extreme suppressor radiator heat directly to your support hand, stalling your active range drill tempos. The **B&T USA® APC9-SD PRO Medium M-LOK Handguard (BT-361579)** completely flatlines this tactical bottleneck, delivering a sleek, direct-replacement structural upgrade optimized for integration over suppressed barrel configurations.
Proudly manufactured in Switzerland and optimized for professional duty tasks, this medium-length handguard is precision CNC-machined from a solid block of **6061-T6 structural grade aerospace aluminum alloy**. The unibody chassis features a full-length top Picatinny rail section that aligns flush with the upper receiver backbone. Swapping out bulky side rails for modern low-profile accessory attachment points, it introduces a clean **3-plane M-LOK® interface matrix** positioned evenly at the 3, 6, and 9 o'clock axis lines. The specialized internal diameter is bored to envelope the oversized SD suppressor canister comfortably, ensuring optimal air cooling tracking lines while keeping a slim handling footprint.
Finished in a resilient, non-reflective Type III hardcoat anodized armor jacket and featuring factory-calibrated lock pin slots, this turn-key armorer hardware ensures absolute accessory stability right on your workbench.
*Armorer Bench Notes & Real-World Handguard Staging Guidance: The B&T BT-361579 handguard conversion module arrives workspace ready, containing the unibody aluminum rail housing and pre-drilled receiver attachment interface ports. PROPRIETARY INTEGRALLY SUPPRESSED FITMENT MATRIX: This modular handguard is engineered natively, strictly, and exclusively to slide over **B&T APC9-SD and APC9-SD PRO integrally suppressed sub-gun or pistol-caliber carbine (PCC) receiver formats**. *Suppressed Diameter Staging:* The large internal channel profile is calibrated specifically to shield and clear the specialized B&T SD sound suppression canister. Universal M-LOK Interface Grid: The attachment ports at the 3 o'clock (right flank), 6 o'clock (underbelly), and 9 o'clock (left flank) positions accept all standard M-LOK compatible tactical accessories, including weapon lights, foregrips, hand stops, and barricade braces. Armorer Workbench Custom Staging Sequence: 1. Visually and physically confirm your host firearm platform is completely clear of live ammunition, the magazine is separated, and the chamber is safe. 2. Remove any pre-existing muzzle accessories or the external SD suppressor canister by unscrewing it counter-clockwise from the barrel threads if required for your model variant. 3. Back out the forward receiver cross-retention pins or locking fasteners from your legacy handguard shell. 4. Slide the older handguard housing straight forward off the barrel tracking block. 5. Clear away accumulated carbon dust debris from the forward receiver tabs with a nylon utility brush. 6. Slide the new BT-361579 medium handguard over the barrel line until it sits completely flush against the upper receiver wall interface. 7. Apply a pin-head droplet of medium blue thread locker to the mounting hardware, align the attachment ports, and secure the fasteners firmly until hand-snug to guarantee a shift-free lock downrange.*
Key Features
- Authentic Swiss B&T OEM: Sourced straight from B&T production lines to guarantee authentic geometric alignment, strict tolerances, and exact factory receiver integration.
- Modern M-LOK Attachment Matrix: Replaces heavy legacy quad-rails with clean M-LOK slots at the 3, 6, and 9 o'clock channels for modern light and hand-stop configurations.
- Oversized SD Internal Bore: Custom-bored internal clearance profile built to wrap around the thick integrally suppressed SD barrel canister without adding exterior bulk.
- Unibody 6061-T6 Aluminum Billet: Multi-axis CNC-machined from a single block of aerospace aluminum to provide maximum front-end structural rigidity and drop drop resistance.
- Integrated Top Picatinny Spine: Built with a full-length Mil-Spec 1913 top rail that matches the upper receiver deck height for seamless iron sight or optic alignment.
- Type III Hardcoat Anodized Finish: Sealed in a deep scratch-resistant matte black anodizing that protects your metal from severe suppressor radiator heat and harsh solvents.
Product Specifications
- Brand: B&T USA® / Brügger & Thomet (Thun, Switzerland / Tampa, FL)
- Model Line: High-Performance Tactical Forend Upgrades & M-LOK Furniture Groups
- MPN/SKU Code: BT-361579 (Medium SD M-LOK Specification Variant Base SKU)
- Optic/Receiver Top Interface: Full-Length Linear Mil-Spec 1913 Picatinny Rail Alignment
- Accessory Attachment Interface: 3-Way M-LOK Grid Configuration (Positions 3, 6, and 9 O'Clock Natively)
- Firearm Model Family Compatibility: APC9-SD and Advanced APC9-SD PRO Sub-Gun Platforms Natively
- Component Functional Class: Front-End Handguard Shield for Integrally Suppressed Barrel Lines
- Structural Material Base: Premium Multi-Axis CNC-Machined Heavy-Duty 6061-T6 Aircraft Grade Aluminum Billet
- Exterior Surface Dressing: Mil-Spec Type III Hardcoat Anodized Non-Reflective Satin Matte Black Armor
- Handguard Profile Tier Length: Medium Profile Layout Optimized for Defensive Control and Lever Ergonomics
- Full Kit Component Checklist: Completed APC9-SD PRO Medium M-LOK Aluminum Handguard Shell Component Only
- Packaging Format Class: Factory Poly Bag Presentation Pack with Genuine B&T Parts Tracking Labels
- Product Type Category: Rifle/Pistol Components / Handguards & Forend Rail Accessories
- Overall Unit Visual Length: ~7.50 Inches Calibrated Linear Front End Extension Clearance
- Net Component Module Mass: ~6.80 Ounces (~192.7 Grams Lightweight Balanced Front-End Structural Mass Profile)
- Global Quality Certifications: Built strictly to NATO Military Specification and Swiss Precision Standards
- Warranty Tracking Protection: Fully Backed by B&T USA Factory Material Defect Coverage
