Armaspec Carb Bff Tube Kit W/ Ep/cn

The Armaspec Carb BFF Tube Kit with End Plate and Castle Nut is a mil-spec buffer tube assembly built for builders who want a no-compromise AR-15 lower receiver component. This complete kit pairs Armaspec's 7075-T6 aluminum construction with the essentials you need for a stock installation—the tube itself, end plate, and castle nut—so you're not hunting for parts across three vendors. Whether you're assembling a tactical rifle, a precision build, or a dependable hunting platform, a solid buffer tube foundation matters for consistency and longevity.

Armaspec manufactures this assembly in the USA and designs it to mil-spec dimensions, meaning it'll mate seamlessly with any standard AR-15 lower and any mil-spec stock. The 7075-T6 aluminum is the same forging grade used in aerospace and high-performance applications—it resists bending and corrosion far better than inferior alloys. The six-position design accommodates a wide range of stock lengths, so you can dial in the best cheek weld and length of pull for your build, your body, and your mission.

This kit eliminates the guesswork and the risk of mixing substandard parts. The end plate and castle nut are sized and finished to work with the tube without wobble or fitment surprises. No gimmicks, no proprietary dimensions—just a clean, functional AR-15 buffer tube assembly that handles hard use and years of shooting.

Key Features

• Mil-spec dimensions for universal AR-15 lower compatibility
• 7075-T6 aluminum construction for strength and corrosion resistance
• Six-position design for adjustable length of pull
• Includes end plate and castle nut—ready to install a stock
• USA-made by Armaspec

Specifications

Frequently Asked Questions

Will this buffer tube fit my AR-15 lower?

Yes. The Armaspec Carb BFF Tube Kit is built to mil-spec dimensions, so it will work with any standard AR-15 lower receiver and any mil-spec stock.

What comes in the kit?

The kit includes the buffer tube itself, an end plate, and a castle nut. You'll need to source a stock separately and will need a castle nut wrench and armourer's tool for installation, but all the core components are included.

Why 7075-T6 aluminum?

7075-T6 is a premium aluminum alloy known for high strength-to-weight ratio and corrosion resistance. It's used in aerospace and demanding applications because it resists bending, denting, and oxidation better than lower-grade aluminum alloys.

Can I adjust the length of pull with the six-position design?

Yes. The six-position tube allows you to install a mil-spec stock at different positions along the tube, giving you flexibility to find the right length of pull for your body and shooting style.