*CONTACT US FOR A SPECIAL COUPON CODE*
Midwest Industries Side Folder w/ Buffer Tube Adapter - 1913 Picatinny Rail Mounted Folding Mechanism, Fits Mil-Spec / Commercial AR Receiver Extensions, Heavy-Duty Steel Locking Mechanism, Anodized Black Finish - MI-STAP-SF-BT / 812102033325
Product Description
Adapting a standard AR-style stock or pistol brace to a bufferless long-gun chassis requires a side-folding mechanism engineered for zero play and instant lockup. Conventional rigid buffer tube mounts add unnecessary overall length during transport, making compact gear bags or vehicle storage tight on your bench. The **Midwest Industries® Side Folder w/ Buffer Tube Adapter (MI-STAP-SF-BT / 812102033325)** flatlines these storage and staging limitations, delivering a heavy-duty **folding buffer tube interface** that attaches directly to any rear 1913 Picatinny rail section.
Proudly engineered, CNC-machined, and field-tested in the United States by Midwest Industries, this side-folding adapter is constructed from high-strength **4140 steel and 6061-T6 aluminum** finished in a non-reflective Type III hard-coat anodized black dressing. The core mechanism utilizes a heavy-duty steel spring-loaded wedge lock that can be configured to fold to either the **left or right side** depending on user preference. The female threaded socket accepts standard Mil-Spec or Commercial AR-15 receiver extension tubes, allowing shooters to attach their favorite AR stocks or pistol braces to bufferless platforms like the Sig Sauer MCX/MPX, CZ Scorpion, AK-47 Picatinny endplates, or Ruger LC Charger straight from their armorer bench.
Engineered to clamp firmly onto standard MIL-STD-1913 Picatinny rear rail sections, this factory-calibrated folding adapter guarantees absolute lockup rigidity directly from your workspace bench.
*Armorer Bench Notes & Real-World Side-Folder Staging Guidance: The Midwest Industries MI-STAP-SF-BT package arrives workspace ready as a pre-assembled side-folding hinge unit complete with the 1913 rail clamp and threaded buffer tube receiver socket. 1913 PICATINNY REAR INTERFACE & BUFFERLESS MATRIX: This adapter is engineered natively, strictly, and dimensionally to mount onto **firearms equipped with a vertical rear 1913 Picatinny rail endplate**. *Bufferless Platform Requirement Notice:* This folding adapter is designed strictly for **bufferless firearms that do NOT require an internal AR-15 recoil buffer and spring assembly** (e.g., Sig MCX/MPX, CZ Scorpion with rail adapter, AK Picatinny endplates, Ruger LC Charger, or Grand Power Stribog). Standard AR-15 direct-impingement rifles *cannot* cycle with this adapter closed. Armorer Workbench Custom Staging Sequence: 1. Visually and physically confirm your host bufferless firearm is completely clear of live ammunition, the magazine is removed, and the chamber is safe and open. 2. Clean the rear vertical Picatinny rail on your receiver or adapter plate using a dry cloth to clear away grease or storage oil. 3. Loosen the side clamp bolt on the Midwest hinge base and position the adapter onto your chosen rear Picatinny rail slots. 4. Verify cross-bolt alignment in the rail groove and torque the side clamp screw to **35 to 40 inch-pounds** using a quality hex drive tool. 5. Thread your Mil-Spec buffer tube into the female threaded collar until snug, locking it in place with a standard castle nut or set screw on your bench. 6. Lift up on the folding buffer tube joint to unlock and fold the assembly flush against the receiver, then snap it open to verify positive steel-on-steel lockup before rolling downrange.*
Key Features
- Direct 1913 Picatinny Rail Mount: Clamps rock-solid to any vertical rear MIL-STD-1913 Picatinny rail interface on bufferless rifles, carbines, and PCCs.
- Reversible Ambidextrous Folding Action: Features a modular hinge mechanism that can be set up to fold to either the left or right side of the receiver.
- Standard AR Buffer Tube Threads: Female socket receives standard Mil-Spec or Commercial AR-15 receiver extensions, letting you mount any standard AR stock or brace.
- Heavy-Duty Steel Locking Wedge: Hardened steel locking components deliver rock-solid lockup in both open and folded positions with zero wobble.
- Type III Hard-Coat Anodized Finish: Machined 6061 aluminum housing and 4140 steel pivot are treated with a matte black protective finish that resists wear, rust, and chemical solvents.
- Ultra-Slim Folded Profile: Locks down flat against the side of the host firearm, drastically reducing overall length for covert transport in compact bags or vehicle vaults.
Product Specifications
- Brand: Midwest Industries® (Grafton, WI / Made in the USA)
- Model Line: Side Folding Stock / Brace Adapters - 1913 Picatinny Mount Series
- MPN/SKU Code: MI-STAP-SF-BT (Side Folder w/ Buffer Tube Adapter Black Standard SKU)
- UPC Code Profile: 812102033325
- Mounting Interface Standard: MIL-STD-1913 Picatinny Vertical Rear Rail Sections
- Firearm Platform Compatibility: Bufferless Firearms (Sig MCX/MPX, CZ Scorpion, AK 1913, Stribog, Ruger LC, etc.)
- Buffer Tube Socket Threads: Standard 1-3/16"-16 UN Female Receiver Extension Threads
- Hinge Fold Direction: User Reversible (Configurable for Left-Side or Right-Side Folding)
- Structural Material Base: Precision CNC-Machined 6061-T6 Aluminum & 4140 Hardened Steel Hinge Lock
- Exterior Finish Dressing: Type III Hard-Coat Anodized Matte Black Armor Shield
- Full Kit Component Checklist: 1x MI-STAP-SF-BT Folding Adapter Unit Complete with Clamp Hardware
- Packaging Format Class: Factory Original Sealed Midwest Industries Branded Heavy Poly Header Pack
- Product Type Category: Rifle Accessories / Side-Folding Stock Adapters & Receiver Extensions
- Overall Added Length: ~1.85 Inches (~47.0 mm Housing Offset Length)
- Net Component Mass: ~8.60 Ounces (~243.8 Grams Heavy-Duty Metal Weight)
- Global Quality Certifications: Formulated to Rigid US Commercial and Tactical Duty Performance Standards
- Warranty Tracking Protection: Fully Backed by Midwest Industries Factory Lifetime Limited Warranty
