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TacFire MAR139 C Short Buffer Tube System for AR Pistol Platform Black Anodized Aluminum with QD End Plate MAR139 C UPC 686294505331
Product Description
The TacFire Short Buffer Tube System for AR Pistol Platforms in Black Anodized Aluminum (MPN: MAR139-C) is a compact, ultra-lightweight receiver extension kit engineered specifically for ultra-short AR-15 pistols, truck guns, and personal defense weapons (PDWs). Designed to dramatically reduce the rear footprint and overall length of standard AR-15 lower receivers, this micro-length buffer tube system delivers smooth cycling performance in a streamlined, minimal-profile package.
Precision CNC-machined in the USA from high-strength 6061-T6 aircraft-grade aluminum alloy, the MAR139-C buffer tube features a matte black anodized hardcoat finish that resists scratch damage, wear, and corrosion. The kit comes complete with a shortened pistol buffer tube, a custom-tuned flat-wire buffer spring, a modified proprietary buffer weight, a castle nut, and an integrated Quick Detach (QD) end plate for single-point or two-point tactical sling attachment.
Engineered to maintain proper bolt carrier group velocity and cycling mechanics despite its shortened overall displacement, the TacFire MAR139-C is a direct drop-in setup for standard AR-15 lower receivers. It serves as an ideal solution for builders seeking maximum concealability and agility without sacrificing firearm functional reliability.
Armorer Bench Notes & Real-World Staging Guidance:
Fitment Matrix: Fits standard MIL-SPEC AR-15 lower receivers chambered in 5.56 NATO, .223 Rem, 300 Blackout, and 9mm PCC. (Note: Uses a proprietary shortened buffer and spring assembly included in the kit; standard carbine springs or buffers cannot be used w/ this short tube).
- Perform a complete firearm safety check: drop the magazine, retract the charging handle, and visually/physically inspect the chamber to verify zero live rounds are present.
- Separate the upper receiver from the lower receiver by driving out the rear takedown pin and front pivot pin.
- Clean and degrease the lower receiver buffer tube threads using isopropyl alcohol or thread preparation cleaner.
- Slide the included QD end plate and castle nut onto the TacFire MAR139-C short buffer tube.
- Thread the buffer tube into the lower receiver until it depresses and captures the buffer retainer pin and spring, maintaining rear takedown detent spring compression w/ the QD end plate.
- Torque the castle nut to 38–40 ft-lbs, stake the endplate twice, insert the included proprietary short spring and buffer assembly, and perform a manual action hand-cycle check.
Key Features
- Ultra-Compact Short Buffer Tube: Reduces overall rear receiver length for maximum AR pistol portability and storage efficiency.
- Integrated QD Sling Mount End Plate: Includes heavy-duty rear steel QD end plate for rapid tactical sling attachment.
- Complete Drop-In System: Includes short buffer tube, castle nut, QD endplate, custom buffer, and tuned recoil spring.
- 6061-T6 Aircraft-Grade Aluminum Construction: Machined from high-strength aluminum for lightweight structural integrity.
- Corrosion-Resistant Anodized Finish: Matte black surface coating protects against moisture, wear, and shop chemical degradation.
- Optimized Recoil Dynamics: Tuned spring rate prevents bolt bounce and ensures positive cycling w/ standard BCGs.
Product Specifications
- Brand: TacFire
- Model/Series: Short Buffer Tube System for AR Pistol
- MPN / SKU: MAR139-C
- UPC: 686294505331
- Platform Compatibility: AR-15 / M4 / AR-9 Lower Receivers
- System Type: Micro / Short Pistol Buffer Tube System
- Material: 6061-T6 Aircraft Aluminum
- Finish / Color: Matte Black Anodized
- Included Hardware: Short Buffer Tube, Castle Nut, QD End Plate, Buffer Weight, Recoil Spring
- Weight: 7.8 oz (Complete Assembly)
- Country of Origin: USA
