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Midwest Industries® Fixed Stock Buffer Tube Adapter – Picatinny Interface – Matte Black – MI-STAP
The Midwest Industries® Fixed Stock Buffer Tube Adapter (MI-STAP) is a 2026-spec premium, combat-grade hardware component engineered to bridge the gap between modular, Picatinny-railed receiver back-plates and standard AR-15 carbine buffer tubes. While modern tactical platforms—such as the SIG Sauer® MCX, Ak-47 variants with railed rear trunnions, Ruger® LC Carbines, and various high-end sub-gun chassis—natively utilize a rear MIL-STD-1913 Picatinny rail section, they severely limit your choice of tactical furniture. The Midwest Industries MI-STAP (812102033158) masterfully re-architects this layout, allowing shooters to bolt on a rigid, heavy-duty mounting bridge that hosts the massive universe of collapsible AR-15 buttstocks.
Precision CNC-machined from a solid block of 6061-T6 aircraft-grade aluminum and armored in a defense-grade Type III hardcoat anodization, this ultra-robust adapter is engineered to handle brutal concrete drops and hard field abuse without flexing or losing zero. The mechanical hallmark of the MI-STAP architecture is its incredibly secure, dual-clamping interface. Unlike cheap castings that wiggle under stress, this adapter utilizes two heavy-duty steel cross-bolts to lock directly onto the rear Picatinny teeth, providing an unyielding, wobble-free foundation. The tracking core features integrated anti-rotation tabs that lock into your buffer tube's bottom keyway channel, entirely eliminating distracting stock spin or loosening during rapid-fire strings. Complete with dual ambidextrous **Quick Detach (QD) mechanical sling swivel sockets** built right into the mounting block, this lightweight 3.4-ounce upgrade keeps your weapon's center of gravity compact while unlocking ultimate stock modularity on the line.
Includes: (1) Midwest Industries Fixed Stock Picatinny-to-Buffer Tube Adapter (Matte Black Aluminum), Integrated Steel Cross-Bolt Clamping Hardware, and Factory Installation Instructions.
*Operational Note: This adapter features a non-folding, rigid geometry designed for absolute structural strength and maximum stock weld stability. It accepts both standard **Mil-Spec and Commercial-Spec AR-15 carbine buffer tubes/receiver extensions**. (Buffer tubes, castle nuts, and stocks are sold separately).
Key Features
- Universal 1913 Picatinny Bridge: Instantly converts any rear vertical Picatinny rail section into a standard threaded hub for telescoping AR-15 receiver extensions.
- Dual Steel Cross-Bolt Clamping: Employs two heavy-duty steel fastening bolts to anchor directly to railed trunnions, guaranteeing a completely rock-solid, zero-movement lockup.
- 6061-T6 Aerospace Aluminum Core: Monolithic billet aluminum build delivers supreme structural rigidity under heavy recoil while keeping total added weight down to 3.4 ounces.
- Ambidextrous QD Sling Swivel Sockets: Outfitted with built-in steel Quick Detach socket ports on both the left and right sides for a streamlined, low-profile tactical carry profile.
- Anti-Rotation Tube Security: Engineered with a specialized mechanical tracking alignment tab to index the buffer tube's lower track, preventing stock twist or backing off.
- Mil-Spec Type III Hardcoat Anodized: Deep matte black chemical armor layer shrugs off corrosive gun cleaning solvents, scratch scoring, and harsh marine environments.
Product Specifications
- Brand: Midwest Industries®
- Product Line: Stock & Brace Adapter Series
- Model Name: Fixed Stock Tube Adapter (Picatinny)
- SKU / MPN: MI-STAP (Catalog Part Reference: MI-STAP-BLK)
- Mounting Interface: MIL-STD-1913 Picatinny Rail Backplates
- Tube Thread Acceptance: Standard 1-3/16"-16 UN (AR-15 Carbine Buffer Tubes)
- Buffer Tube Compatibility: Mil-Spec or Commercial-Spec Diameter Receiver Extensions
- Firearm Fitment: SIG MCX/MPX, railed AK trunnions, CZ Scorpion railed adapters, etc.
- Chassis Core Material: 6061-T6 Billet Structural Aluminum
- Clamping Bolt Hardware: Heat-Treated Carbon Steel
- Finish Treatment: Matte Black Type III Class 2 Hardcoat Anodization
- Stock Action Type: Fixed / Non-Folding
- Country of Origin: Proudly Made in the USA
- Overall Adapter Length: 1.625 Inches (41.2 mm)
- Product Base Weight: 3.40 oz (96.3 g) with clamping bolts
- UPC: 812102033158
