TacFire A2 Complete Stock Kit — .223/5.56 AR-15 | Polymer — Black — MAR123 • UPC: 745557101083
Build or refresh your AR-15 with classic A2 ergonomics and rock-solid reliability. The TacFire A2 Complete Stock Kit (MAR123) delivers everything needed to finish the rear end of a .223/5.56 AR platform: a durable polymer A2-style buttstock, matching buffer tube and Castle nut, buffer spring and buffer, and all installation hardware. Designed for shooters who want proven A2 comfort and utility in a high-value, easy-to-install package, this kit provides the familiar blend of stability, storage, and conservative styling that has anchored AR builds for decades.
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Product Overview
The TacFire MAR123 A2 Complete Stock Kit is a factory-alike solution for finishing or repairing AR-15 lower assemblies chambered in .223 Rem / 5.56×45 NATO. The kit centers on a rugged polymer A2 buttstock that provides secure shoulder purchase, integrated sling attachment points, and internal storage for small tools or spare parts. Matched with a mil-spec compatible buffer tube, buffer, and spring, this kit is intended for straightforward installation on AR-15 lowers built to standard specifications.
Key Features & Benefits
Complete Rear Kit: Includes A2-style polymer buttstock, buffer tube, buffer spring, buffer weight, castle nut, end plate, and mounting hardware — everything needed to complete the lower receiver’s rear assembly.
Purposeful A2 Ergonomics: Classic A2 profile offers a broad, comfortable contact surface and a slightly curved toe for predictable cheek-weld and recoil control across a variety of shooting positions.
Durable Polymer Construction: High-strength polymer stock resists impact, moisture, and temperature extremes while keeping weight low.
Mil-Spec Compatibility: Designed to fit mil-spec buffer tubes and standard AR-15 lower receivers—ideal for builders using common, off-the-shelf components.
Integrated Storage Compartment: Internal buffer compartment stores spare parts or cleaning essentials, keeping field maintenance compact and convenient.
Sling-ready: Built-in sling loop and mounting provisions make attaching single- or two-point slings quick and secure.
Attractive Finish: Matte black polymer provides a subdued, low-glare appearance that blends with modern tactical and hunting builds.
What’s Included
TacFire A2 polymer buttstock (black)
Mil-spec buffer tube (receiver extension)
Buffer spring and buffer (standard weight appropriate for 5.56/.223)
Castle nut and end plate
Mounting hardware and installation fasteners
(Contents listed are typical for MAR123 kits; verify packaging for exact included parts.)
Compatibility & Fit Notes
Caliber / Platform: Intended for .223 Rem / 5.56×45 NATO AR-15 style platforms. The kit provides rear-assembly parts and does not alter chambering.
Buffer Tube: Fits mil-spec (1.14" outer diameter) buffer tubes. If you use a commercial-size receiver extension, confirm tube diameter before installation.
Lower Receiver Fit: Works with standard AR-15 lower receivers; custom or proprietary lowers may require fit confirmation.
Stock Accepts Standard Buffers: Use the included buffer or interchange with standard AR-15 buffer weights to tune felt recoil and cycling with your particular upper and ammunition.
Performance & Practical Advantages
Proven Ergonomics: The A2 shape reliably positions the shooter for repeatable sight alignment and a stable cheek weld—valuable for plinking, hunting, and training.
Reliable Operation: Matched buffer spring and buffer assist consistent cycling in most typical gas-system/bolt carrier configurations when used on AR-15 uppers.
Low Maintenance: Polymer construction resists corrosion and requires minimal upkeep—wipe down with a cloth and inspect mounting hardware periodically.
Lightweight & Balanced: The combination of polymer stock and mil-spec tube keeps weight minimal while preserving rear weight needed for stable aiming.
Installation & Maintenance (High-Level)
Tools Required: Common hand tools—armorer’s wrench or adjustable wrench for castle nut torque, punch set for detent pins, and torque recommendations per manufacturer.
Basic Steps: Install receiver extension into lower, secure end plate and castle nut, install buffer spring and buffer, slide on A2 stock and torque castle nut to specification. If unfamiliar with armorer procedures, seek a qualified gunsmith.
Maintenance: Periodically inspect castle nut torque, buffer spring condition, and stock for cracks or excessive wear. Replace worn springs or hardware as needed.
Who Should Buy This
DIY builders completing a new AR-15 build who want classic A2 styling.
Owners replacing a damaged or worn stock assembly with a reliable, cost-effective kit.
Range enthusiasts and hunters who prefer the solid cheek weld and low-profile appearance of the A2 design.
Armories and shops stocking straightforward, mil-spec-compatible parts for repairs and customer builds.
Safety & Legal Notes
No Change to Firearm Classification: This kit is a furniture and receiver extension replacement and does not alter firearm classification when installed to create a compliant AR-15. Always ensure your build complies with federal, state, and local laws.
Professional Help Recommended if Unsure: If you lack experience assembling AR components, have a qualified gunsmith perform installation and function checks. Improper installation can lead to malfunctions or unsafe conditions.
Technical Specifications (High-Level)
Model / SKU: MAR123
UPC: 745557101083
Platform: AR-15 / .223 Rem / 5.56×45 NATO
Stock Style: A2 polymer buttstock (complete kit)
Material: High-strength polymer (stock), steel receiver extension and hardware
Finish: Matte black
Compatibility: Mil-spec buffer tubes and standard AR-15 lowers
Buying Tips & Final Considerations
Confirm buffer tube diameter on your lower (mil-spec vs commercial) to ensure compatibility.
If you plan to run non-standard gas systems, heavy buffers, or suppressed configurations, consider consulting parts charts or a gunsmith to select the ideal buffer weight.
Compare the A2 profile to collapsible or adjustable stocks if you need adjustability for multiple shooters—A2 is fixed but offers a reliable, rugged profile.
Check the retailer for warranty and return policy details before purchase.
Summary
The TacFire A2 Complete Stock Kit (MAR123) is a dependable, no-nonsense rear assembly solution for builders and owners who prefer classic A2 ergonomics on their AR-15 platform. Combining durable polymer construction, mil-spec compatibility, and an easy-to-install parts set, this kit streamlines completion or repair of the lower receiver while delivering comfortable, repeatable shoulder purchase and field-ready durability.
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