TacFire MAR084 Mil-Spec M4 Stock Kit Black
$29.34
The TacFire MAR084 Mil-Spec M4 Stock Kit is a complete, drop-in receiver extension assembly built to standard military specifications. If you're assembling an AR-15 carbine from a stripped lower or refreshing an older platform, this kit gives you everything needed to install a functional, adjustable cheek rest in one go—no hunting down individual components or worrying about compatibility headaches.
This is purpose-built hardware for shooters who value straightforward, no-nonsense performance. The six-position adjustability means you can dial in length of pull to fit your body, gear configuration, and shooting style, whether you're running a sling, body armor, or nothing but a t-shirt. The included 3 oz. buffer and carbine-length spring are tuned for standard 5.56 NATO cycling; the mil-spec buffer tube and castle nut ensure rock-solid lockup. The regular end plate is the baseline choice—reliable and proven across thousands of builds.
Black anodized finish resists corrosion and blends seamlessly with modern AR furniture. This kit appeals to entry-level builders, competition shooters tightening up older rigs, and anyone who needs a dependable, spec-correct assembly without premium pricing or marketing noise.
Key Features
- Complete mil-spec receiver extension assembly—buffer tube, stock, buffer, spring, end plate, and castle nut included
- Six-position adjustable M4-style stock for customizable length of pull
- 3 oz. buffer and carbine-length spring optimized for 5.56 NATO
- Military-specification construction ensures compatibility with standard lower receivers
- Black finish for corrosion resistance and clean appearance
Specifications
| Brand | TacFire |
| Model | MAR084 |
| Type | Mil-Spec M4 Stock Kit |
| Position Adjustments | 6 |
| Buffer Weight | 3 oz. |
| Spring Type | Carbine Length |
| Finish | Black |
| Kit Includes | Buffer Tube (Mil-Spec), M4 Stock, Buffer (3 oz.), Spring (Carbine Length), End Plate (Regular), Castle Nut |
Frequently Asked Questions
Is this stock kit compatible with my AR-15 lower receiver?
Yes. The TacFire MAR084 is built to mil-spec standards and will fit any AR-15 or AR-pattern lower receiver with a standard receiver extension pocket. The buffer tube, castle nut, and end plate follow military specifications, ensuring reliable fitment across platforms.
What's included in this kit, and do I need anything else?
The kit includes a 6-position adjustable M4 stock, mil-spec buffer tube, 3 oz. buffer, carbine-length buffer spring, regular end plate, and castle nut. This is a complete assembly—everything you need to install a functional stock on a stripped lower. You do not need to source separate components.
Is the 3 oz. buffer the right choice for 5.56 NATO?
Yes. The 3 oz. buffer included in this kit is designed to work with standard 5.56 NATO ammunition and the carbine-length spring provided. This combination is a proven, mil-spec pairing for reliable bolt carrier group cycling.
Can I adjust the length of pull?
Absolutely. The M4 stock offers six positions, allowing you to adjust length of pull to fit your frame, gear, and shooting preferences—from compressed length for armor or heavy outerwear to fully extended for standard firing positions.
