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TacFire A2 Mil-Spec Buffer Tube Kit — Black Aluminum Receiver Extension for AR-15 (.223 Rem / 5.56×45 NATO) | Model MAR110 (UPC: 811261026490)
Upgrade the backbone of your AR-15 with the TacFire A2 Mil-Spec Buffer Tube Kit (Model MAR110) — a rugged, dependable receiver extension kit engineered for reliable cycling, consistent buffer alignment, and long-term durability. Designed specifically for .223 Rem / 5.56×45mm NATO platforms, this black aluminum A2 mil-spec kit gives builders and shooters a factory-style fit and finish while supporting standard mil-spec components and stocks.
Premium Construction & Mil-Spec Fit
The TacFire A2 Mil-Spec Buffer Tube is precision-formed from high-strength aluminum and finished in a durable black coating to resist corrosion and wear. The A2 mil-spec diameter and threading ensure compatibility with standard mil-spec carbine stocks and components, delivering the secure, wobble-free fit AR-15 owners expect. Whether you’re building a new rifle or upgrading a serviceable one, this kit provides the dependable receiver extension foundation every modern sporting rifle needs.
Complete Kit for Hassle-Free Installation
The TacFire MAR110 buffer tube kit is thoughtfully packaged to include the essential parts needed to outfit a mil-spec lower receiver: the A2 mil-spec receiver extension (buffer tube), buffer spring, and buffer (sold as a kit). Each part is matched and tested to ensure smooth buffer movement and consistent function across a wide range of operating conditions. The kit’s components integrate cleanly with standard mil-spec castle nuts, end plates, and stocks for a straightforward assembly experience.
Optimized for .223 Rem / 5.56×45mm NATO Platforms
Specifically intended for AR-15 rifles chambered in .223 Remington / 5.56×45mm NATO, the TacFire A2 Mil-Spec Buffer Tube Kit supports common buffer weights and spring tensions for reliable gas-system timing and recoil characteristics. Use it with approved mil-spec buffers and springs to fine-tune your rifle’s performance for range, duty, or competition use.
Durable Finish & Corrosion Resistance
A hard black finish protects the tube from abrasion and environmental exposure. The coating maintains an unobtrusive tactical appearance and pairs well aesthetically with a wide range of black polymer and metal stocks, grips, and accessories.
Key Features
Brand: TacFire
Model: MAR110
UPC: 811261026490
Type: A2 Mil-Spec Buffer Tube Kit / Receiver Extension Kit
Compatibility: AR-15 / M4-style lower receivers; ideal for .223 Rem / 5.56×45mm NATO platforms
Material: High-strength aluminum receiver extension with protective black finish
Includes: A2 mil-spec buffer tube (receiver extension), buffer spring, buffer (kit configuration)
Fitment: Mil-spec diameter and threading for compatibility with standard carbine stocks and components
Intended Use: Firearm builds, upgrades, repairs, and parts replacement
Benefits & Performance
Reliable Cycling: Matched spring and buffer components promote consistent shooting cycles and dependable ejection/feeding.
Mil-Spec Compatibility: Standardized dimensions simplify upgrades and reduce fitment issues with third-party stocks.
Lightweight Strength: Aluminum construction provides a durable, lightweight receiver extension that won’t add unnecessary bulk.
Easy Integration: Works seamlessly with common mil-spec end plates, castle nuts, and carbine-style buttstocks.
Tactical Aesthetic: Matte black finish complements black polymer and metal components for a cohesive build.
Who This Kit Is For
Firearm builders and armorers assembling AR-15 style rifles.
Shooters replacing worn or damaged receiver extensions.
Competitive shooters and service personnel seeking a reliable, mil-spec foundation.
Hobbyists and DIY gun owners performing upgrades or repairs.
Installation & Safety Notes
This kit is designed for compatibility with mil-spec AR-15 lower receivers and components. Installation should be performed by a qualified gunsmith or by a knowledgeable builder following all federal, state, and local laws governing firearms and parts. Always ensure the firearm is unloaded and follow standard safety procedures during installation and function checks.
SEO Keywords (for product listings)
TacFire MAR110, TacFire A2 Buffer Tube Kit, A2 Mil-Spec Buffer Tube, AR-15 Buffer Tube Kit, .223 Rem buffer tube, 5.56x45mm receiver extension, TacFire 811261026490, AR15 A2 receiver extension, mil-spec buffer kit, black aluminum buffer tube, AR-15 build parts, carbine buffer tube kit, TacFire MAR-110.
Whether you’re finishing a precision build, replacing worn components, or upgrading to a mil-spec foundation, the TacFire A2 Mil-Spec Buffer Tube Kit (MAR110) delivers the fit, finish, and functional reliability you need for .223/5.56 AR-15 platforms.
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